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 A133718 #7 Sep 13 2015 21:06:26 %S A133718 1,13,81,325,995,2541,5698,11586,21825,38665,65131,105183,163891, %T A133718 247625,364260,523396,736593,1017621,1382725,1850905,2444211,3188053, %U A133718 4111526,5247750,6634225,8313201,10332063,12743731,15607075 %N A133718 Column 3 of array in A133713. %p A133718 A133718 := proc(l) %p A133718 A133713(l,3) ; %p A133718 end proc: %p A133718 seq(A133718(l),l=2..30) ; # _R. J. Mathar_, Nov 23 2011 %K A133718 nonn %O A133718 2,2 %A A133718 _N. J. A. Sloane_, Dec 30 2007