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 A185622 #4 Mar 30 2012 18:37:25
%S A185622 1,1,5,27,173,1330,12134,129359,1587501,22127494,346245249,6021401618,
%T A185622 115373290404,2417393483696,55028734386699,1353170738090204,
%U A185622 35764709876549353,1011496211524329699,30490289594142366215
%N A185622 Column 2 of triangular matrix T = A185620, which satisfies: T^3 - T^2 + I = SHIFT_LEFT(T).
%o A185622 (PARI) {A185620(n, k)=local(A=Mat(1), B); for(m=1, n, B=A^3-A^2+A^0;
%o A185622 A=matrix(m+1, m+1); for(i=1, m+1, for(j=1, i, if(i<2|j==i, A[i, j]=1,
%o A185622 if(j==1, A[i, j]=1, A[i, j]=B[i-1, j-1]))))); return(A[n+1, k+1])}
%o A185622 /* Column 2: */ {a(n)=A185620(n+2, 2)}
%Y A185622 Cf. A185620, A185621, A185623.
%K A185622 nonn
%O A185622 0,3
%A A185622 _Paul D. Hanna_, Feb 01 2011