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A005477 2^(n-1)*(2^n-1)*product( 2^j+1, j =1..n-1). 0
1, 18, 420, 16200, 1138320, 152681760, 40012315200, 20727639504000, 21349793828563200, 43852643645542617600, 179883715700853141120000, 1474687052822610564537600000, 24170122236238340825650936320000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

MAPLE

f := i->2^(i-1)*(2^i-1)*product( '2^j+1', 'j'=1..i-1);

CROSSREFS

Sequence in context: A318598 A215229 A172135 * A326368 A197343 A289941

Adjacent sequences:  A005474 A005475 A005476 * A005478 A005479 A005480

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 13 15:41 EST 2019. Contains 329106 sequences. (Running on oeis4.)