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 A133717 #8 Sep 13 2015 21:06:37 %S A133717 1,21,266,2541,20097,138103,849514,4771889,24828755,120944516, %T A133717 556107055,2429461391,10137839293,40585353434,156451707633, %U A133717 582555425669,2100914443649,7355423560191,25050878785976,83145222843357,269368091719619 %N A133717 Row l=7 of array in A133713. %p A133717 A133717 := proc(c) %p A133717 A133713(7,c) ; %p A133717 end proc: %p A133717 seq(A133717(c),c=0..30) ; # _R. J. Mathar_, Nov 23 2011 %K A133717 nonn %O A133717 0,2 %A A133717 _N. J. A. Sloane_, Dec 30 2007