A303569 - OEIS

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A303569

a(n) = [x^n] ((Sum_{k=0..n} (k+7)!*x^k)/(Sum_{k=0..n} (k+7)!*(-x)^k))^(1/8).

1, 2, 2, 80, 158, 9428, 21740, 1814144, 4326566, 480716188, 1138919436, 162673628256, 377710551084, 67537379669352, 153236971128120, 33578612305618176, 74565718435602822, 19669491236331371820, 42886189370197775372, 13410838610779209885664

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

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

PROG

(PARI) N=20; x='x+O('x^N); Vec((sum(k=0, N, (k+7)!*x^k)/sum(k=0, N, (k+7)!*(-x)^k))^(1/8))

CROSSREFS

Cf. A303565, A303567, A303568, A303614.

Sequence in context: A130678 A370736 A230054 * A156523 A191779 A156511

Adjacent sequences: A303566 A303567 A303568 * A303570 A303571 A303572

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Apr 26 2018

STATUS

approved