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 A113104 #3 Mar 30 2012 18:36:51
%S A113104 1,1,16,1251,481376,930005021,9082872004032,448356882751890343,
%T A113104 111655372144044770735104,140027604270897805074354921849,
%U A113104 883117855371077265832943940474315776
%N A113104 Main diagonal of square table A113103; also, a(n) equals the n-th term in column 0 of the matrix n-th power of triangle A113106.
%o A113104 (PARI) {a(n,q=5)=local(M=matrix(n+1,n+1));for(r=1,n+1, for(c=1,r, M[r,c]=if(r==c,1,if(c>1,(M^q)[r-1,c-1])+(M^q)[r-1,c]))); return((M^n)[n+1,1])}
%Y A113104 Cf. A113103, A113106.
%K A113104 nonn
%O A113104 0,3
%A A113104 _Paul D. Hanna_, Oct 14 2005