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A003955 (1*3*5*...*(2n+1))^2*(2n+4). 0
4, 54, 1800, 110250, 10716300, 1512784350, 292183491600, 73958946311250, 23749039426612500, 9430743556307823750, 4537044990907363935000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..10.

CROSSREFS

Equals (2n+4) * A001818(n+1).

Sequence in context: A225823 A265004 A284747 * A182264 A094154 A168510

Adjacent sequences:  A003952 A003953 A003954 * A003956 A003957 A003958

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Joe Keane (jgk(AT)jgk.org)

STATUS

approved

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Last modified June 20 09:12 EDT 2019. Contains 324234 sequences. (Running on oeis4.)