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A008380 4*(2n-1)!*H(2n), where H(n) = Sum 1/i are harmonic numbers. 0
6, 50, 1176, 54792, 4251456, 495480960, 80990184960, 17683570598400, 4972664013004800, 1750589607352320000, 754268505333719040000, 390464536066453094400000, 239146855253471119933440000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

Sequence in context: A105617 A094072 A058784 * A196905 A066303 A136383

Adjacent sequences:  A008377 A008378 A008379 * A008381 A008382 A008383

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 1 23:55 EDT 2014. Contains 247527 sequences.