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 A162303 #2 Mar 30 2012 18:59:25
%S A162303 1,1,1,2,4,1,3,12,8,1,5,31,39,13,1,8,73,148,93,19,1,13,162,481,486,
%T A162303 186,26,1,21,344,1406,2080,1274,332,34,1,34,707,3803,7741,6920,2873,
%U A162303 547,43,1
%N A162303 Product matrix [C(k,n-k)]*A001263.
%C A162303 First column is A000045. Row sums are A052705(n+2).
%F A162303 Number triangle T(n,k)=sum{j=0..n, C(j,n-j)*C(j+1,k)*C(j+1,k+1)/(j+1)}.
%e A162303 Triangle begins
%e A162303 1,
%e A162303 1, 1,
%e A162303 2, 4, 1,
%e A162303 3, 12, 8, 1,
%e A162303 5, 31, 39, 13, 1,
%e A162303 8, 73, 148, 93, 19, 1,
%e A162303 13, 162, 481, 486, 186, 26, 1,
%e A162303 21, 344, 1406, 2080, 1274, 332, 34, 1
%K A162303 easy,nonn,tabl
%O A162303 0,4
%A A162303 _Paul Barry_, Jun 30 2009