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 A201236 #14 Apr 10 2020 02:12:10 %S A201236 0,2,18,88,250,558,1078,1888,3078,4750,7018,10008,13858,18718,24750, %T A201236 32128,41038,51678,64258,79000,96138,115918,138598,164448,193750, %U A201236 226798,263898,305368,351538,402750,459358,521728,590238,665278,747250,836568,933658,1038958 %N A201236 Number of ways to place 2 non-attacking wazirs on an n X n toroidal board. %C A201236 A wazir is a leaper [0,1]. %H A201236 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, p.402 %F A201236 a(n) = n^2*(n^2-5)/2, n>=3. %F A201236 G.f.: 2*x^2 * (2*x^5 - 9*x^4 + 15*x^3 - 9*x^2 - 4*x - 1)/(x-1)^5. %Y A201236 Cf. A172225, A201237, A201238, A201239, A201240, A201241, A201242. %K A201236 nonn %O A201236 1,2 %A A201236 _Vaclav Kotesovec_, Nov 28 2011