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 A187052 #11 Feb 20 2025 19:36:21 %S A187052 0,0,0,80,22200,226864,961728,2625640,5543744,9907248,15787528, %T A187052 23174472,32030516,42322492,54034656,67163804,81709936,97673052, %U A187052 115053152,133850236,154064304,175695356,198743392,223208412,249090416,276389404,305105376,335238332,366788272 %N A187052 Number of 8-step one or two space at a time bishop's tours on an n X n board summed over all starting positions. %H A187052 R. H. Hardin, <a href="/A187052/b187052.txt">Table of n, a(n) for n = 1..35</a> %F A187052 Empirical: a(n) = 708492*n^2 - 8834104*n + 27135516 for n>13. %e A187052 Some solutions for 4 X 4: %e A187052 ..8..0..2..0....6..0..3..0....0..6..0..3....0..8..0..1....3..0..8..0 %e A187052 ..0..7..0..1....0..7..0..4....5..0..2..0....7..0..4..0....0..2..0..5 %e A187052 ..3..0..5..0....2..0..5..0....0..4..0..7....0..2..0..5....7..0..4..0 %e A187052 ..0..4..0..6....0..1..0..8....1..0..8..0....3..0..6..0....0..6..0..1 %Y A187052 Row 8 of A187046. %K A187052 nonn %O A187052 1,4 %A A187052 _R. H. Hardin_, Mar 02 2011