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 A054502 #5 Mar 31 2012 21:03:15 %S A054502 1,1,1,2,1,2,3,5,1,3,23,30,40,4,132,218,5,1859,29517,1,2,9,18,51,470, %T A054502 7170,387830,1,6,1215,121487,89997968 %N A054502 Counting sequence for classification of nonattacking queens on n X n toroidal board. %Y A054502 See comments and references for A054500. %Y A054502 Cf. A054500, A054501, A053994, A007705, A006841. %K A054502 nonn,nice,hard %O A054502 1,4 %A A054502 _Matthias Engelhardt_ %E A054502 More terms from _Matthias Engelhardt_, Jan 11 2001