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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
OFFSET
0,11
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
KEYWORD
nonn,less
AUTHOR
Alex Ratushnyak, Oct 27 2013
STATUS
approved