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A303568
a(n) = [x^n] ((Sum_{k=0..n} (k+3)!*x^k)/(Sum_{k=0..n} (k+3)!*(-x)^k))^(1/4).
4
1, 2, 2, 32, 62, 1764, 3916, 173376, 393446, 25166076, 56406348, 4958003840, 10882283500, 1264942740680, 2721161685880, 405344510959872, 857860989902854, 159511701001085164, 333452808033317004, 75711389658286217024, 156849644184430434436
OFFSET
0,2
LINKS
PROG
(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))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Apr 26 2018
STATUS
approved