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A228449 floor(n! / 4^n). 0
1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 9, 28, 92, 324, 1217, 4871, 20703, 93166, 442542, 2212711, 11616735, 63892044, 367379253, 2204275523, 13776722023, 89548693155, 604453678799, 4231175751597, 30676024199079, 230070181493096, 1783043906571497, 14264351252571976 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

LINKS

Table of n, a(n) for n=0..32.

MATHEMATICA

Table[Floor[n!/4^n], {n, 0, 40}] (* Harvey P. Dale, Jun 07 2014 *)

PROG

(Python)

import math

for n in range(99): print str(math.factorial(n)/(4**n))+', ',

CROSSREFS

Cf. A000142, A066979, A212310.

Sequence in context: A215007 A105849 A243156 * A131203 A191637 A238978

Adjacent sequences:  A228446 A228447 A228448 * A228450 A228451 A228452

KEYWORD

nonn,less

AUTHOR

Alex Ratushnyak, Oct 27 2013

STATUS

approved

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Last modified July 10 11:42 EDT 2020. Contains 335576 sequences. (Running on oeis4.)