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 A279116 #9 Dec 21 2016 12:18:26 %S A279116 0,0,0,0,39,6472,311552,5576682,56289710,389130774,2059061646, %T A279116 8924241327,33134160010,108698226956,322211640480 %N A279116 Number of non-equivalent ways to place 7 non-attacking kings on an n X n board. %C A279116 Rotations and reflections of placements are not counted. If they are to be counted, see A194788. %e A279116 There are 39 non-equivalent ways to place 7 non-attacking kings on a 5 X 5 board, e.g., this one: %e A279116 K...K %e A279116 ..... %e A279116 K.K.K %e A279116 ..... %e A279116 K...K %Y A279116 Cf. A194788, A279111 (2 kings), A279112 (3 kings), A279113 (4 kings), A279114 (5 kings), A279115 (6 kings), A279117, A236679. %K A279116 nonn,more %O A279116 1,5 %A A279116 _Heinrich Ludwig_, Dec 10 2016