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

Author

Seiichi Manyama, Apr 26 2018

Keywords

• nonn

Links

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

Crossrefs

Cf. A303566, A303568, A303569.

Programs

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))