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 A102388 #22 Apr 29 2025 19:13:25 %S A102388 1,0,0,0,0,0,0,0,0,4,44,6,78,8,16,18,234,124,468,516,882,2092,7068, %T A102388 22794,85456,275732,974048,3698242,14120996,59531852,252272512, %U A102388 1163430462,5229335374 %N A102388 Number of ways of placing n nonattacking Queens of the Night on an n X n board. %C A102388 A Queen of the Night can move like a Queen or a Nightrider, which is a rider along straight lines of Knight moves. %H A102388 Noam D. Elkies, <a href="http://www.math.harvard.edu/~elkies/chess.html">Chess Pages and Links</a>. %H A102388 P. Syski, S. J. Wernli, <a href="http://www.people.fas.harvard.edu/~swernli/queenofnight.htm">Queen of the Night on an n X n board</a>. %H A102388 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, 2013, p. 350. %H A102388 W. Schubert, <a href="http://web.archive.org/web/20130708134012/http://m29s20.vlinux.de/~wschub/nqueen.html">N-Queens page</a>. %o A102388 (C++) // See code on website. %Y A102388 Cf. A051223, A051224, A000170. %K A102388 nonn,hard,more,nice %O A102388 1,10 %A A102388 Stefan Wernli, Peter Syski (swernli(AT)fas.harvard.edu), Jan 07 2005 %E A102388 Terms a(20)-a(28) from _Vaclav Kotesovec_, Jun 18 2010 and Feb 02 2011 %E A102388 Terms a(29)-a(32) from Wolfram Schubert, Jul 24 2011 %E A102388 Term a(33) from Wolfram Schubert, May 27 2012