id:A048642 - OEIS Search Results

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Partial products of A003188 (Gray code).

+0
3

1, 1, 3, 6, 36, 252, 1260, 5040, 60480, 786240, 11793600, 165110400, 1651104000, 18162144000, 163459296000, 1307674368000, 31384184832000, 784604620800000, 21184324761600000, 550792443801600000, 16523773314048000000 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(0) = 1, a(n) = product(XORnos(j, floor(j/2)), j=1..n)`
	CROSSREFS	`a((2^n)-1) = A000142[ (2^n)-1 ] for all n.` `Sequence in context: A068084 A003674 A120595 this_sequence A077532 A093800 A068776` `Adjacent sequences: A048639 A048640 A048641 this_sequence A048643 A048644 A048645`
	KEYWORD	`easy,nonn`
	AUTHOR	`Antti Karttunen, Jul 14 1999`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research