A303568 a(n) = [x^n] ((Sum_{k=0..n} (k+3)!*x^k)/(Sum_{k=0..n} (k+3)!*(-x)^k))^(1/4).

1, 2, 2, 32, 62, 1764, 3916, 173376, 393446, 25166076, 56406348, 4958003840, 10882283500, 1264942740680, 2721161685880, 405344510959872, 857860989902854, 159511701001085164, 333452808033317004, 75711389658286217024, 156849644184430434436

Offset: 0

Author

Seiichi Manyama, Apr 26 2018

Keywords

• nonn

Links

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

Crossrefs

Cf. A303565, A303567, A303569.

Programs

PARI

N=66; x='x+O('x^N); Vec((sum(k=0, N, (k+3)!*x^k)/sum(k=0, N, (k+3)!*(-x)^k))^(1/4))