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 A121277 #11 Sep 08 2013 13:30:53
%S A121277 1,2,4,10,32,126,588,3171,19382,132099,990756,8093603,71436060,
%T A121277 676734190,6842383982,73483900031,834766518890,9994386677811,
%U A121277 125715770020804,1656716763283342,22816308485104494,327646842078735037,4896100535018809108,75994281001001114847
%N A121277 Row sums of triangle A062993.
%H A121277 Alois P. Heinz, <a href="/A121277/b121277.txt">Table of n, a(n) for n = 0..200</a>
%F A121277 a(n) = Sum_{k=0..n} A062993(n,k).
%p A121277 b:= (n,k)-> binomial((k+2)*(n-k), n-k) /((k+1) *(n-k)+1):
%p A121277 a:= n-> add (b(n, k), k=0..n):
%p A121277 seq (a(n), n=0..25); # _Alois P. Heinz_, Apr 07 2011
%K A121277 nonn
%O A121277 0,2
%A A121277 _Philippe Deléham_, Aug 23 2006
%E A121277 More terms from _Alois P. Heinz_, Apr 07 2011