login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Clark Kimberling, Table of n, a(n) for n = 1..500

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

Cf. A000142, A104510, A284995.

Sequence in context: A072374 A122852 A192573 * A107113 A156807 A032256

Adjacent sequences:  A284991 A284992 A284993 * A284995 A284996 A284997

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Apr 08 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 19 06:18 EST 2022. Contains 350464 sequences. (Running on oeis4.)