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