login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A024188 ((n+2)!/2)(1/3 - 1/4 + ... + c/(n+2)), where c = (-1)^(n+1). 1
1, 1, 17, 42, 654, 2712, 44568, 264240, 4721040, 36694080, 716523840, 6917823360, 147356496000, 1703866752000, 39427129728000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..15.

FORMULA

a(n) = A024176(n)/2

PROG

(PARI) a(n) = (n+2)!*sum(x=1, n, (-1)^(x+1)/(x+2))/2 \\Michel Marcus, Mar 21 2013

CROSSREFS

Sequence in context: A253605 A044094 A044475 * A196209 A196476 A086006

Adjacent sequences:  A024185 A024186 A024187 * A024189 A024190 A024191

KEYWORD

nonn

AUTHOR

Clark Kimberling

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 September 16 06:38 EDT 2019. Contains 327090 sequences. (Running on oeis4.)