A303672 a(n) = [x^n] (5040 / Sum_{k=0..n} (k+7)!*x^k)^(1/4).

1, -2, -8, -60, -600, -7152, -96456, -1430544, -22933920, -393013280, -7144207808, -137001926144, -2760226854816, -58242464679360, -1283886660610560, -29506641823939200, -705788634473952000, -17544801385483584000, -452659831142363014400

Offset

0,2

Links

Seiichi Manyama, Table of n, a(n) for n = 0..444

Maple

[seq(coeff(series((factorial(7)/add(factorial(k+7)*x^k, k=0..n))^(1/4), x, 30), x, n), n=0..25)]; # Muniru A Asiru, Apr 29 2018

Prog

(PARI) N=66; x='x+O('x^N); Vec((7!/sum(k=0, N, (k+7)!*x^k))^(1/4))

Crossrefs

Cf. A077607, A303671, A303673.

Sequence in context: A364395 A208124 A052622 * A303062 A001188 A355100

Adjacent sequences: A303669 A303670 A303671 * A303673 A303674 A303675

Keyword

sign

Author

Seiichi Manyama, Apr 28 2018

Status

approved