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 A243720 #8 Jun 19 2014 11:50:40 %S A243720 2,49,1244,12329,81900,398907,1562362,5153001,14907120,38753358, %T A243720 92417760,204977323,427812496,847346181,1604300270 %N A243720 Number of inequivalent (mod D_8) ways to place 5 nonattacking knights on an n X n board. %F A243720 a(n) = (n^10 - 90*n^8 + 240*n^7 + 3235*n^6)/960 + O(n^5) for n >= 8. %Y A243720 Cf. A243716, A172136, A243717, A243718, A243719. %K A243720 nonn,more %O A243720 3,1 %A A243720 _Heinrich Ludwig_, Jun 19 2014