%I A104448
%S A104448 1,3,6,13,33,101,372,1624,8263,48285,320031,2380114,19675986,179314868,
%T A104448 1788473424,19398149629,227510745445,2871040422932,38810001746171,
%U A104448 559745948482030,8582882169611759,139467832061599433
%N A104448 Row sums of triangle A104446.
%C A104448 A104446 equals the square of triangular matrix A104445, read by rows, 
               where X=[A104445] satisfies: SHIFT_LEFT_UP(X) = X^2 - X + I.
%F A104448 a(n) = A091352(n) + A091352(n-1) for n>0.
%o A104448 (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(sum(k=1,n+1,(A^2)[n+1,k]))}
%Y A104448 Cf. A104446, A104445, A091352, A091351.
%Y A104448 Sequence in context: A018014 A162483 A026538 this_sequence A062466 A053564 
               A036781
%Y A104448 Adjacent sequences: A104445 A104446 A104447 this_sequence A104449 A104450 
               A104451
%K A104448 nonn
%O A104448 0,2
%A A104448 Paul D. Hanna (pauldhanna(AT)juno.com), Mar 08 2005