0,2

(PARI) {a(n, q=2)=local(A=Mat(1), B); if(n<0, 0, for(m=1, n+2, 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]=if(i>2, (A^q)[i-1, 2], 1), B[i, j]=(A^q)[i-1, j-1])); )); A=B); return(sum(k=0, n, A[n+1, k+1])))}

Cf. A111975 (triangle), A078537 (variant).

Sequence in context: A030862 A030923 A039831 this_sequence A020120 A020097 A139149

Adjacent sequences: A111974 A111975 A111976 this_sequence A111978 A111979 A111980

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Aug 25 2005