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 A187304 #9 Jul 22 2025 10:41:43 %S A187304 0,0,54,2968,25716,87432,209700,399524,668522,1010572,1430378,1921532, %T A187304 2485628,3120300,3825896,4601996,5448634,6365780,7353434,8411596, %U A187304 9540266,10739444,12009130,13349324,14760026,16241236,17792954,19415180,21107914 %N A187304 Number of 9-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions. %C A187304 Row 9 of A187296 %H A187304 R. H. Hardin, <a href="/A187304/b187304.txt">Table of n, a(n) for n = 1..50</a> %F A187304 Empirical: a(n) = 35254*n^2 - 316744*n + 644876 for n>15 %K A187304 nonn %O A187304 1,3 %A A187304 _R. H. Hardin_ Mar 08 2011