id:A005477 - OEIS Search Results

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2^(n-1)*(2^n-1)*product( 2^j+1, j =1..n-1).

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1, 18, 420, 16200, 1138320, 152681760, 40012315200, 20727639504000, 21349793828563200, 43852643645542617600, 179883715700853141120000, 1474687052822610564537600000, 24170122236238340825650936320000 (list; graph; listen)

	OFFSET	`0,2`
	MAPLE	`f := i->2^(i-1)(2^i-1)product( '2^j+1', 'j'=1..i-1);`
	CROSSREFS	`Sequence in context: A159647 A111454 A116421 this_sequence A086501 A053115 A084273` `Adjacent sequences: A005474 A005475 A005476 this_sequence A005478 A005479 A005480`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

AT&T Labs Research