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 A201237 #14 Apr 10 2020 02:13:26 %S A201237 0,0,6,208,1300,4908,14112,34112,73008,142700,259908,447312,734812, %T A201237 1160908,1774200,2635008,3817112,5409612,7518908,10270800,13812708, %U A201237 18316012,23978512,31027008,39720000,50350508,63249012,78786512,97377708,119484300,145618408 %N A201237 Number of ways to place 3 non-attacking wazirs on an n X n toroidal board. %C A201237 A wazir is a leaper [0,1]. %H A201237 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, p.402 %F A201237 a(n) = n^2*(n^4-15*n^2+62)/6, n>=4. %F A201237 G.f.: -2*x^3 * (3*x^7 - 15*x^6 + 25*x^5 - 7*x^4 - 17*x^3 - 15*x^2 + 83*x + 3)/(x-1)^7. %Y A201237 Cf. A172226, A201236, A201238, A201239, A201240, A201241, A201242. %K A201237 nonn %O A201237 1,3 %A A201237 _Vaclav Kotesovec_, Nov 28 2011