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 A119364 #2 Mar 30 2012 18:59:15
%S A119364 0,1,1,1,11,81,351,1149,3529,12601,52724,222641,879308,3295384,
%T A119364 12303201,47320365,186738507,739129809,2894481813,11237844615,
%U A119364 43647142533,170543919327,669744238998,2633027605209,10337488816041,40544676533466
%N A119364 Central coefficients of number triangle A119335.
%C A119364 A119363(n)-a(n)=A119365(n).
%F A119364 a(n)=sum{k=0..n-1, C(n+1,3k)*C(n-1,3k)}; a(n)=A119335(2n,n+1).
%K A119364 easy,nonn
%O A119364 0,5
%A A119364 _Paul Barry_, May 16 2006