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^2)[i-1, 1], B[i, j]=(A^2)[i-1, j])); )); A=B); return(sum(k=0, n, A[n+1, k+1]))}

Cf. A102086, A102087.

Sequence in context: A005921 A082426 A054381 this_sequence A088142 A049370 A009343

Adjacent sequences: A102085 A102086 A102087 this_sequence A102089 A102090 A102091

nonn

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