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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119837 a(n)=(2n)!/n!-(2n)!/(n-1)!. 1
1, 0, -12, -240, -5040, -120960, -3326400, -103783680, -3632428800, -141145804800, -6033983155200, -281585880576000, -14248245557145600, -777177030389760000, -45464856277800960000, -2839804869044183040000, -188644180586506444800000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Row sums of number triangle A119836.

LINKS

Table of n, a(n) for n=0..16.

FORMULA

a(n)=A001813(n)-2*A001814(n).

MATHEMATICA

f[n_]:=Module[{n2f=(2n)!}, n2f/n!-n2f/(n-1)!]; f/@Range[0, 20]  (* Harvey P. Dale, Feb 13 2011 *)

CROSSREFS

Sequence in context: A009052 A213449 A012303 * A012538 A006588 A009150

Adjacent sequences:  A119834 A119835 A119836 * A119838 A119839 A119840

KEYWORD

easy,sign

AUTHOR

Paul Barry, May 25 2006

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 May 24 00:38 EDT 2019. Contains 323528 sequences. (Running on oeis4.)