A145168 G.f. A(x) satisfies A(x/A(x)^3) = 1/(1-x)^2.

1, 2, 15, 226, 4959, 136338, 4361818, 155947386, 6080986701, 254568183028, 11318103523886, 530301559146450, 26035289254487166, 1333502730683975402, 71012366873757289557, 3921010145962481940986, 223985973308662486807733

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Formula

Self-convolution square of A145167.

Self-convolution cube yields A145170.

Prog

(PARI) {a(n)=local(A=1+x+x*O(x^n), B); for(n=0, n, B=serreverse(x/A^3); A=1/(1-B)^2); polcoeff(A, n)}

Crossrefs

Cf. A145167, A145169, A145170 (A^3).

Sequence in context: A207037 A218798 A176337 * A184357 A090301 A297087

Adjacent sequences: A145165 A145166 A145167 * A145169 A145170 A145171

Keyword

nonn

Author

Paul D. Hanna, Oct 03 2008

Status

approved