This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A292149 #15 Jan 27 2020 02:02:38 %S A292149 0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,0,0,1,1,2,1,1,3,2,1,3,2,3,1,4,6, %T A292149 3,3,3,3,8,1,8,11,3,4,5,8,9,5,11,8,11,6,10,13,8,9,11,17,13,6,14,11,21, %U A292149 8,15,25,13,12,17,20,22,12,18,24,22,13,27,27 %N A292149 Number of distinct convex heptagons that can be formed from n congruent isosceles right triangles. Reflections are not counted as distinct. %C A292149 Illustrated with other convex polyabolos in A245676. %H A292149 Douglas J. Durian, <a href="/A292149/b292149.txt">Table of n, a(n) for n = 1..750</a> %e A292149 The smallest convex heptagonal polyabolos are for n = 15 (symmetrical) and n = 17 (asymmetrical). %Y A292149 Strictly less than A245676. %K A292149 nonn %O A292149 1,23 %A A292149 _Douglas J. Durian_, Sep 13 2017 %E A292149 a(33) and beyond from _Douglas J. Durian_, Jan 25 2020