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 A201369 #11 Jun 20 2017 22:36:51 %S A201369 0,0,0,0,27,21792,3324193,119138166,1979541332,20142680752, %T A201369 145977165234,824771174978,3850985758339,15461577137802, %U A201369 54912339921707,176153338628674,518569625849418,1418340918023792,3639736652346172,8833161922947702,20405252721413369 %N A201369 Number of ways to place 8 nonattacking kings on an n X n board. %H A201369 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a> %F A201369 Explicit formula (_Vaclav Kotesovec_, after values computed by _Andrew Woods_, Nov 30 2011): (n^16 - 252*n^14 + 336*n^13 + 27762*n^12 - 70896*n^11 - 1699656*n^10 + 6330240*n^9 + 60677169*n^8 - 304864560*n^7 - 1181816748*n^6 + 8314366704*n^5 + 8495481308*n^4 - 121101870624*n^3 + 74007948336*n^2 + 730891869120*n - 1180990460160)/40320, n>=7. %F A201369 G.f.: -x^5*(14882*x^18 - 180784*x^17 + 1061244*x^16 - 4500406*x^15 + 15038864*x^14 - 34328850*x^13 + 40903004*x^12 - 8667835*x^11 + 23857551*x^10 - 260744627*x^9 + 545801251*x^8 - 276255996*x^7 - 467674682*x^6 + 484515328*x^5 + 391528458*x^4 + 65572237*x^3 + 2957401*x^2 + 21333*x + 27)/(x-1)^17. %Y A201369 Cf. A061995, A061996, A061997, A061998, A172158, A193580, A194788. %K A201369 nonn %O A201369 1,5 %A A201369 _Vaclav Kotesovec_, Nov 30 2011