A185622 - OEIS

%I #4 Mar 30 2012 18:37:25

%S 1,1,5,27,173,1330,12134,129359,1587501,22127494,346245249,6021401618,

%T 115373290404,2417393483696,55028734386699,1353170738090204,

%U 35764709876549353,1011496211524329699,30490289594142366215

%N  Column 2 of triangular matrix T = A185620, which satisfies: T^3 - T^2 + I = SHIFT_LEFT(T).

%o  (PARI) {A185620(n, k)=local(A=Mat(1), B); for(m=1, n, B=A^3-A^2+A^0;

%o 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 if(j==1, A[i, j]=1, A[i, j]=B[i-1, j-1]))))); return(A[n+1, k+1])}

%o /* Column 2: */ {a(n)=A185620(n+2, 2)}

%Y  Cf. A185620, A185621, A185623.

%K nonn

%O 0,3

%A _Paul D. Hanna_, Feb 01 2011