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A006548 (2*n)!-Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n). 0
0, 24, 480, 40320, 2903040, 479001600, 74724249600, 20922789888000, 5690998849536000, 2432902008176640000, 1021818843434188800000, 620448401733239439360000, 372269041039943663616000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

FORMULA

4*floor(n/2) * (2n-1)!. - Ralf Stephan, Mar 08 2004

CROSSREFS

Sequence in context: A200979 A052715 A052725 * A159877 A319426 A275041

Adjacent sequences:  A006545 A006546 A006547 * A006549 A006550 A006551

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 27 15:49 EST 2020. Contains 332307 sequences. (Running on oeis4.)