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 A102103 #4 Mar 30 2012 18:36:44
%S A102103 0,2,16,1040,196080,82196224,65585046960,89664824687968,
%T A102103 194650170795350624,633421180929983545024,2953697281799409438455088,
%U A102103 19035190329068182887341039344,164578521474330559730154886587328
%N A102103 Column 1 of triangular matrix A102101, which shifts upward to exclude the main diagonal under matrix fourth power.
%o A102103 (PARI) {a(n)=local(A=matrix(2,2),B);A[1,1]=1; for(m=2,n+1,B=matrix(m,m);for(i=1,m, for(j=1,i, if(j==i,B[i,j]=j,if(j==1,B[i,j]=(A^4)[i-1,1], B[i,j]=(A^4)[i-1,j]));));A=B); return(A[n+1,2])}
%Y A102103 Cf. A102101.
%K A102103 nonn
%O A102103 0,2
%A A102103 _Paul D. Hanna_, Dec 29 2004