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 A182408 #13 May 17 2021 03:32:35 %S A182408 2,7,34,743,1546,598078,6027057,10163241031,242407820869 %N A182408 Number of ways to place k non-attacking knights on an n x n toroidal chessboard, summed over all k >= 0. %H A182408 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, 2013, p.310 %Y A182408 Cf. A141243, A182407, A067958, A027683, A067960. %K A182408 nonn,hard,more %O A182408 1,1 %A A182408 _Vaclav Kotesovec_, May 09 2012