A303567 a(n) = [x^n] ((Sum_{k=0..n} (k+1)!*x^k)/(Sum_{k=0..n} (k+1)!*(-x)^k))^(1/2).

1, 2, 2, 16, 30, 492, 1052, 29632, 64582, 2842220, 6118860, 393285408, 831896748, 74023348728, 154261364376, 18199799667456, 37519687909062, 5669520927708492, 11601413537799692, 2184087758215537120, 4446590269784808388, 1020018234043912680104

Offset

0,2

Links

Seiichi Manyama, Table of n, a(n) for n = 0..448

Prog

(PARI) N=66; x='x+O('x^N); Vec((sum(k=0, N, (k+1)!*x^k)/sum(k=0, N, (k+1)!*(-x)^k))^(1/2))

Crossrefs

Cf. A303566, A303568, A303569.

Sequence in context: A152556 A113123 A353912 * A177832 A230800 A363236

Adjacent sequences: A303564 A303565 A303566 * A303568 A303569 A303570

Keyword

nonn

Author

Seiichi Manyama, Apr 26 2018

Status

approved