A117264 Self-convolution square-root of A117263.

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

Offset

0,3

Links

Table of n, a(n) for n=0..12.

Prog

(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]}

Crossrefs

Sequence in context: A331389 A243435 A064570 * A256043 A065072 A088389

Adjacent sequences: A117261 A117262 A117263 * A117265 A117266 A117267

Keyword

nonn

Author

Paul D. Hanna, Mar 14 2006

Status

approved