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 A187192 #16 Apr 19 2022 07:37:32 %S A187192 0,0,720,9792,58800,231840,705600,1800960,4046112,8251200,15594480, %T A187192 27720000,46846800,75889632,118591200,179665920,264955200,381594240, %U A187192 538190352 %N A187192 Number of 5-turn rook's tours on an n X n board summed over all starting positions. %F A187192 Empirical: a(n) = 16*n^6 - 98*n^5 + 228*n^4 - 238*n^3 + 92*n^2. %F A187192 Empirical G.f.: 48*x^3*(15+99*x+112*x^2+14*x^3)/(1-x)^7. [_Colin Barker_, Jan 22 2012] %e A187192 Some solutions for 3X3 %e A187192 ..0..5..1....0..0..4....0..1..5....1..0..2....1..0..0....4..0..5....2..3..1 %e A187192 ..0..0..2....2..0..3....0..3..4....0..5..0....2..0..5....3..0..0....0..0..0 %e A187192 ..0..4..3....1..0..5....0..2..0....0..4..3....3..0..4....2..1..0....5..4..0 %Y A187192 Row 5 of A187189. %K A187192 nonn,more %O A187192 1,3 %A A187192 _R. H. Hardin_, Mar 06 2011