0,2

A113392 equals the matrix square of A113389, which has the property: Column k of A113389^2 = column 0 of A113381^(3*k+3) for k>=0.

(PARI) {a(n)=local(A, B); A=Mat(1); for(m=2, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3|j==i|j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(3*j-2))[i-j+1, 1])); )); A=B); (matrix(#A, #A, r, c, if(r>=c, (A^(3*c))[r-c+1, 1]))^2)[n+1, 1]}

Cf. A113392, A113389, A113381, A113388 (column 0).

Sequence in context: A052731 A052711 A113388 this_sequence A138426 A108092 A052744

Adjacent sequences: A113390 A113391 A113392 this_sequence A113394 A113395 A113396

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Nov 14 2005