0,2

(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(sum(k=0, n, A[n+1, k+1]))}

Cf. A102101.

Sequence in context: A077144 A101633 A054783 this_sequence A054287 A001539 A113854

Adjacent sequences: A102101 A102102 A102103 this_sequence A102105 A102106 A102107

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Dec 29 2004