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 A343406 #31 Jun 07 2025 08:20:30 %S A343406 1,2,2,9,40,218,1377,9285,65039,465888,3385778,24864272,184115213, %T A343406 1372589329,10291503008,77544953479 %N A343406 Number of generalized polyforms on the truncated hexagonal tiling with n cells. %C A343406 Equivalently, the number of polyhexes with n-k cells and k distinguished vertices. %C A343406 This sequence counts "free" polyforms where holes are allowed. This means that two polyforms are considered the same if one is a rigid transformation (translation, rotation, reflection or glide reflection) of the other. %H A343406 Peter Kagey, <a href="/A343406/a343406.hs.txt">Haskell program for computing sequence</a>. %H A343406 Peter Kagey, <a href="/A343406/a343406.pdf">The a(3) = 9 generalized polyforms on the truncated hexagonal tiling with 3 cells</a>. %H A343406 Wikipedia, <a href="https://en.wikipedia.org/wiki/Truncated_hexagonal_tiling">Truncated hexagonal tiling</a> %Y A343406 Analogous for other tilings: A000105 (square), A000228 (hexagonal), A000577 (triangular), A197156 (prismatic pentagonal), A197159 (floret pentagonal), A197459 (rhombille), A197462 (kisrhombille), A197465 (tetrakis square), A309159 (snub square), A343398 (trihexagonal), A343577 (truncated square). %K A343406 nonn,more,hard %O A343406 0,2 %A A343406 _Peter Kagey_, Apr 14 2021 %E A343406 a(10)-a(15) from _Bert Dobbelaere_, Jun 06 2025