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 A151538 #13 Feb 16 2025 08:33:09 %S A151538 1,2,6,14,40,102,284,752,2069,5547,15134,40712,110456,297066,802808, %T A151538 2156378,5810329,15584271,41894990,112217372,301115391,805584175, %U A151538 2158366236,5768337730,15435275815,41214200699,110164972820,293922598172,784925297952,2092745480990,5584229143243 %N A151538 Number of 1-sided strip polyedges with n cells. %C A151538 With A001411 as main input and counting the symmetrical shapes separately, higher terms can be computed efficiently (see formula). - _Bert Dobbelaere_, Jan 07 2019 %H A151538 Bert Dobbelaere, <a href="/A151538/b151538.txt">Table of n, a(n) for n = 1..60</a> %H A151538 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151538 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polyedge.html">Polyedge</a> %F A151538 a(n) = (A001411(n) + A323189(n)) / 8. - _Bert Dobbelaere_, Jan 07 2019 %Y A151538 Cf. A001411, A019988, A037245, A151537, A323189 (program). %K A151538 nonn,hard %O A151538 1,2 %A A151538 _Ed Pegg Jr_, May 13 2009 %E A151538 a(13)-a(19) from _Joseph Myers_, Oct 03 2011 %E A151538 More terms using formula by _Bert Dobbelaere_, Jan 07 2019