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A272656 Bisection of A003319: A003319(2n). 3
0, 1, 13, 461, 29093, 2829325, 392743957, 73943424413, 18176728317413, 5661698774848621, 2181096921557783605, 1018705098450570562877, 567347013156626397484421, 371514945708955154128328461, 282629242654284555347577144277, 247210800978211588125067686948317 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

MATHEMATICA

(* b = A003319 *) b[0] = 0; b[n_] := b[n] = n! - Sum[k!*b[n-k], {k, 1, n-1} ]; a[n_] := b[2 n]; Table[a[n], {n, 0, 15}] (* Jean-Fran├žois Alcover, Feb 18 2018 *)

CROSSREFS

Cf. A003319, A272657.

Sequence in context: A218586 A251601 A166184 * A081862 A198012 A197895

Adjacent sequences:  A272653 A272654 A272655 * A272657 A272658 A272659

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 15 2016

STATUS

approved

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Last modified February 18 05:40 EST 2019. Contains 320245 sequences. (Running on oeis4.)