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(A[n+1, 2])}

Cf. A102101.

Sequence in context: A084595 A002543 A125791 this_sequence A060597 A091479 A016031

Adjacent sequences: A102100 A102101 A102102 this_sequence A102104 A102105 A102106

nonn

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