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 A201239 #10 Sep 12 2015 11:00:27 %S A201239 0,0,0,128,6745,100332,754453,3830016,15038541,49207020,140410699, %T A201239 360001152,846775007,1855033964,3828109545,7507096576,14087087961, %U A201239 25436160108,44395753647,75184958080,123935571963,199389702380,313797119069,484055619840,733144325125 %N A201239 Number of ways to place 5 non-attacking wazirs on an n X n toroidal board. %C A201239 Wazir is a leaper [0,1]. %H A201239 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, p.402 %F A201239 a(n) = n^2*(n^8 - 50n^6 + 995n^4 - 9370n^2 + 35424)/120, n>=6. %F A201239 G.f.: -x^4 * (10x^12 - 110x^11 + 685x^10 - 2771x^9 + 6946x^8 - 9350x^7 + 1710x^6 + 15214x^5 - 21392x^4 + 656x^3 + 33177x^2 + 5337x + 128)/(x-1)^11. %Y A201239 Cf. A172228, A201236, A201237, A201238, A201240, A201241, A201242. %K A201239 nonn %O A201239 1,4 %A A201239 _Vaclav Kotesovec_, Nov 28 2011