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 A109960 #3 Mar 30 2012 18:59:08 %S A109960 1,1,1,1,5,1,1,15,9,1,1,35,45,13,1,1,70,165,91,17,1,1,126,495,455,153, %T A109960 21,1,1,210,1287,1820,969,231,25,1,1,330,3003,6188,4845,1771,325,29,1, %U A109960 1,495,6435,18564,20349,10626,2925,435,33,1,1,715,12870,50388,74613,53130 %N A109960 Number triangle binomial(n+3k,4k). %C A109960 Riordan array (1/(1-x), x/(1-x)^4). Rows sums are A055988. Diagonal sums are A109961. Inverse array is A109962. %F A109960 Number triangle T(n, k)=binomial(n+3k, 4k) %e A109960 Rows begin %e A109960 1; %e A109960 1,1; %e A109960 1,5,1; %e A109960 1,15,9,1; %e A109960 1,35,45,13,1; %e A109960 1,70,165,91,17,1; %K A109960 easy,nonn,tabl %O A109960 0,5 %A A109960 _Paul Barry_, Jul 06 2005