A117264 Self-convolution square-root of A117263.

1, 1, 3, 29, 831, 69107, 16944055, 12387543565, 27116679815367, 177967005474840987, 3503280999913078429261, 206872249547698485286567247, 36647212198301159763279385189667

Offset: 0

Author

Paul D. Hanna, Mar 14 2006

Keywords

• nonn

Programs

PARI

{a(n)=local(A2=vector(n+1,m,sum(k=0,m-1,3^((m-k-1)*(m+k-2)/2))));Vec(Ser(A2)^(1/2))[n+1]}