0,2

Equals the odd bisection of A102917. Triangle A102098 shifts each column up 1 row under matrix cube.

(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^3)[i-1, 1], B[i, j]=(A^3)[i-1, j])); )); A=B); return((A^2)[n+1, 2])}

Cf. A102920, A102098, A102917.

Sequence in context: A012977 A013108 A111846 this_sequence A139688 A072445 A000841

Adjacent sequences: A102919 A102920 A102921 this_sequence A102923 A102924 A102925

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Jan 21 2005