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 A133715 #7 Sep 13 2015 21:07:01 %S A133715 1,10,65,325,1371,5087,17080,52835,152606,415602,1075410,2660010, %T A133715 6320476,14485642,32131580,69181744,144943566,296136752,591142760, %U A133715 1154839554,2211164332,4154912452,7671082770,13930509344,24906380837,43880045952 %N A133715 Row l=5 of array in A133713. %p A133715 A133715 := proc(c) %p A133715 A133713(5,c) ; %p A133715 end proc: %p A133715 seq(A133715(c),c=0..30) ; # _R. J. Mathar_, Nov 23 2011 %K A133715 nonn %O A133715 0,2 %A A133715 _N. J. A. Sloane_, Dec 30 2007