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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
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
KEYWORD
easy,sign
AUTHOR
Paul Barry, May 25 2006
STATUS
approved

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)