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 A115296 #4 Mar 30 2012 18:59:13
%S A115296 1,0,1,0,1,1,0,0,2,1,0,0,1,2,1,0,0,0,2,2,1,0,0,0,1,3,2,1,0,0,0,0,2,3,
%T A115296 2,1,0,0,0,0,1,3,3,2,1,0,0,0,0,0,2,4,3,2,1,0,0,0,0,0,1,3,4,3,2,1,0,0,
%U A115296 0,0,0,0,2,4,4,3,2,1,0,0,0,0,0,0,1,3,5,4,3,2,1,0,0,0,0,0,0,0,2,4,5,4,3,2,1
%N A115296 Skew version of correlation triangle for constant sequence 1.
%C A115296 Row sums are A001399. Diagonal sums are A025795.
%F A115296 G.f.: 1/((1-x*y)*(1-x^2*y)*(1-x^3*y^2)); Number triangle T(n, k)=sum{j=0..k, [j<=n-k]*[j<=2k-n]}; T(n, k)=A003983(k, n-k).
%e A115296 Triangle begins
%e A115296 1;
%e A115296 0,1;
%e A115296 0,1,1;
%e A115296 0,0,2,1;
%e A115296 0,0,1,2,1;
%e A115296 0,0,0,2,2,1;
%e A115296 0,0,0,1,3,2,1;
%e A115296 0,0,0,0,2,3,2,1;
%K A115296 easy,nonn,tabl
%O A115296 0,9
%A A115296 _Paul Barry_, Jan 19 2006