\begin{tikzpicture}[scale=0.7, every node/.style={transform shape}]
	\begin{pgfonlayer}{nodelayer}
		\node [style=doubled node] (1) at (-3, 0) {1};
		\node [style=white node] (2) at (-1.75, 2.25) {2};
		\node [style=doubled node] (3) at (-0.75, 4.25) {3};
		\node [style=white node] (4) at (0.25, 6) {4};
		\node [style=doubled node] (5) at (1, 7.5) {5};
		\node [style=white node] (6) at (2, 9.5) {6};
		\node [style=doubled node] (7) at (3, 11.25) {7};
		\node [style=white node] (8) at (4, 9.5) {8};
		\node [style=doubled node] (9) at (5, 7.5) {9};
		\node [style=white node] (10) at (5.75, 6) {10};
		\node [style=doubled node] (11) at (6.75, 4.25) {11};
		\node [style=white node] (12) at (7.75, 2.25) {12};
		\node [style=doubled node] (13) at (9, 0) {13};
%
		\node [style=white node] (14) at (7, 0) {14};
		\node [style=doubled node] (15) at (5, 0) {15};
		\node [style=white node] (16) at (3, 0) {16};
		\node [style=doubled node] (17) at (1, 0) {17};
		\node [style=white node] (18) at (-1, 0) {18};
	% Inner nodes
		\node [style=white node] (19) at (0, 2) {19};
		\node [style=white node] (20) at (3, 8) {20};
		\node [style=white node] (21) at (6, 2) {21};
		\node [style=white node] (22) at (1.75, 5) {22};
		\node [style=white node] (23) at (4.25, 5) {23};
		\node [style=white node] (24) at (3, 2.5) {24};
	\end{pgfonlayer}
	\begin{pgfonlayer}{edgelayer}
		% Outermost edge
		\draw (1) to (7);
		\draw (7) to (13);
		\draw (13) to (1);
		% Innermost dotted triangle
		\draw [style=dashed edge] (22) to (23);
		\draw [style=dashed edge] (23) to (24);
		\draw [style=dashed edge] (24) to (22);
		% Thick edges
		\draw [style=thick edge] (4) to (22);
		\draw [style=thick edge] (10) to (23);
		\draw [style=thick edge] (16) to (24);
%
		\draw [style=thick edge] (19) to (23);
		\draw [style=thick edge] (20) to (24);
		\draw [style=thick edge] (21) to (22);
		% Corner plain edges 1,7, 13
		\draw [style=plain edge] (1) to (19);
		\draw [style=plain edge] (7) to (20);
		\draw [style=plain edge] (13) to (21);
	\end{pgfonlayer}
	\begin{pgfonlayer}{background}
		%\fill[cyan,opacity=1] \convexpath{1,3,2}{8pt};
	\end{pgfonlayer}
\end{tikzpicture}