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A284999
Ceiling(Gamma(2n/3)).
2
2, 1, 1, 2, 3, 6, 15, 41, 120, 390, 1356, 5040, 19885, 82835, 362880, 1665838, 7988888, 39916800, 207304279, 1116669004, 6227020800, 35886673907, 213407853923, 1307674368000, 8245960182039, 53446811415730, 355687428096000, 2427977164711193, 16984208960998390
OFFSET
1,1
COMMENTS
There are two integer-valued interpolations between successive factorials.
LINKS
FORMULA
a(n) = ceiling(Gamma(2n/3)).
MATHEMATICA
Table[Ceiling[Gamma[2n/3]], {n, 1, 35}]
CROSSREFS
Sequence in context: A212359 A130030 A088022 * A016732 A077948 A077971
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 08 2017
STATUS
approved