0,2

(PARI) {a(n, q=4)=local(A=Mat(1), B); if(n<0, 0, for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, if(j==1, B[i, j]=(A^q)[i-1, 1], B[i, j]=(A^q)[i-1, j-1])); )); A=B); return(sum(k=0, n, A[n+1, k+1])))}

Cf. A111845 (triangle), A078537 (variant).

Sequence in context: A086992 A115965 A001142 this_sequence A013132 A013057 A027686

Adjacent sequences: A111844 A111845 A111846 this_sequence A111848 A111849 A111850

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Aug 23 2005