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A284994 Floor(Gamma(n/2)). 2
1, 1, 0, 1, 1, 2, 3, 6, 11, 24, 52, 120, 287, 720, 1871, 5040, 14034, 40320, 119292, 362880, 1133278, 3628800, 11899423, 39916800, 136843365, 479001600, 1710542068, 6227020800, 23092317922, 87178291200, 334838609873, 1307674368000, 5189998453040 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
COMMENTS
The bisections are A000142 (factorials) and A014510.
LINKS
FORMULA
a(n) = floor(Gamma(n/2)).
EXAMPLE
Let s = sqrt(Pi); for n>=1, gamma(n/2) takes the values s, 1, s/2, 1, 3s/4, 2, 15s/8, 6, so that a(n) begins with 1,1,0,1,1,2,3,6.
MATHEMATICA
Table[Floor[Gamma[n/2]], {n, 1, 35}]
CROSSREFS
Sequence in context: A072374 A122852 A192573 * A107113 A156807 A032256
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 08 2017
STATUS
approved

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Last modified June 12 11:47 EDT 2024. Contains 373331 sequences. (Running on oeis4.)