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%I #6 Aug 01 2020 17:37:36
%S 1,2,3,12,20,72,168,528,1440,4480,13046,40008,120055,366324,1109745,
%T 3380752,10269819,31253904,95011267,288979680,878550498,2671223720,
%U 8120041693,24682865208,75020015675,227999634772,692872971246,2105464666676
%N Total number of triangles in all polyiamonds with n triangles.
%H S. T. Coffin, <a href="https://johnrausch.com/PuzzlingWorld/chap02.htm#fig024">The Puzzling World of Polyhedral Dissections</a>, Chap 2, Table 1.
%Y a(n) = n*A000577(n).
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Aug 04 2004
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