A008380 - OEIS

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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: A361193 A363315 A058784 * A196905 A066303 A301436

Adjacent sequences: A008377 A008378 A008379 * A008381 A008382 A008383

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved