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 A057707 #33 Mar 05 2024 07:13:40 %S A057707 1,8,80,1296,22601,426305,8340302,167925635,3453618607 %N A057707 a(n) is the number of free 'polyominoes' on the (4.8.8) grid with n octagons and n squares. %C A057707 This sequence enumerates a subset of the polyforms enumerated by A343577. - _John Mason_, Jan 15 2023 %H A057707 John Mason, <a href="/A057707/a057707.jpg">Illustration for n = 2</a> %H A057707 Wikipedia, <a href="https://en.wikipedia.org/wiki/Truncated_square_tiling">Truncated square tiling</a>. %H A057707 Livio Zucca, <a href="http://www.iread.it/lz/polymultiforms2.html">PolyMultiForms</a> %Y A057707 Cf. A343577. %K A057707 nonn,nice,more %O A057707 1,2 %A A057707 Warren Power (wjpnply(AT)hotmail.com), Oct 24 2000 %E A057707 Better description from Larry Reeves (larryr(AT)acm.org), Nov 30 2000 %E A057707 a(6)-a(8) from _John Mason_, Jan 15 2023 %E A057707 a(9) from _John Mason_, Mar 01 2023