%I A104447
%S A104447 1,2,5,13,39,139,587,2897,16462,106301,771313,6228073,55494336,
%T A104447 541651873,5753940704,66147591142,818802488476,10864622564915,
%U A104447 153914784829775,2319599022540318,37068215129072522,626279667948552452
%N A104447 Column 1 of triangular matrix A104446.
%C A104447 A104446 equals the square of triangular matrix A104445, read by rows, 
               where X=A104445 satisfies: SHIFT_LEFT_UP(X) = X^2 - X + I.
%F A104447 a(n) = A091352(n-1) + A091353(n-1).
%o A104447 (PARI) {a(n)=local(A=Mat(1),B);for(m=1,n+1,B=A^2-A+A^0; A=matrix(m+1,
               m+1);for(i=1,m+1, for(j=1,i, if(i<2|j==i,A[i,j]=1,if(j==1,A[i,j]=1,
               A[i,j]=B[i-1,j-1]))))); return((A^2)[n+2,2])}
%Y A104447 Cf. A104446, A091352, A091353.
%Y A104447 Sequence in context: A022894 A149861 A148305 this_sequence A127986 A133448 
               A149862
%Y A104447 Adjacent sequences: A104444 A104445 A104446 this_sequence A104448 A104449 
               A104450
%K A104447 nonn
%O A104447 0,2
%A A104447 Paul D. Hanna (pauldhanna(AT)juno.com), Mar 08 2005