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 A187294 #9 May 19 2024 20:35:19 %S A187294 0,0,1512,345120,3123680,11693984,28716816,55430032,92058752, %T A187294 138378368,194130148,259136336,333313864,416629232,509072912, %U A187294 610642384,721337268,841157504,970103092,1108174032,1255370324,1411691968,1577138964 %N A187294 Number of 9-step one or two space at a time rook's tours on an n X n board summed over all starting positions. %C A187294 Row 9 of A187286. %H A187294 R. H. Hardin, <a href="/A187294/b187294.txt">Table of n, a(n) for n = 1..50</a> %F A187294 Empirical: a(n) = 4562676*n^2 - 39873424*n + 80572112 for n>15. %Y A187294 Cf. A187286. %K A187294 nonn %O A187294 1,3 %A A187294 _R. H. Hardin_, Mar 08 2011