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 A026887 #6 Jun 15 2014 16:36:59 %S A026887 1,3,11,44,186,819,3725,17402,83156,405116,2006696,10083578,51303146, %T A026887 263851841,1369807435,7170160392,37803475750,200584271466, %U A026887 1070306614530,5739790997296,30919312935436,167228980869678,907759276349466 %N A026887 T(2n+1,n+1), T given by A026769. %p A026887 A026887 := proc(n) %p A026887 A026769(2*n+1,n+1) ; %p A026887 end proc: # _R. J. Mathar_, Jun 15 2014 %K A026887 nonn %O A026887 0,2 %A A026887 _Clark Kimberling_