A145163 G.f. A(x) satisfies A(x/A(x)^2) = 1/(1-x)^2.

1, 2, 11, 112, 1641, 30140, 645173, 15451056, 403860149, 11337503566, 338096504646, 10626420868004, 349970070311727, 12024016865644052, 429479863355216596, 15904295505436515676, 609244677411755423589

Offset

0,2

Links

Vaclav Kotesovec, Table of n, a(n) for n = 0..260

Formula

Self-convolution square of A145162.

Self-convolution square yields A145164.

Prog

(PARI) {a(n)=local(A=1+x+x*O(x^n), B); for(n=0, n, B=serreverse(x/A^2); A=1/(1-B)^2); polcoeff(A, n)}

Crossrefs

Cf. A145162, A145164 (A^2).

Sequence in context: A363481 A099933 A098437 * A205073 A069574 A090534

Adjacent sequences: A145160 A145161 A145162 * A145164 A145165 A145166

Keyword

nonn

Author

Paul D. Hanna, Oct 03 2008

Status

approved