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A048643 Differences between partial products of Gray code (A048642) and factorials (A000142). +0
2
0, 0, 1, 0, 12, 132, 540, 0, 20160, 423360, 8164800, 125193600, 1172102400, 11935123200, 76281004800, 0, 10461394944000, 428917192704000, 14781951055872000, 429147343392768000, 14090871305871360000 (list; graph; listen)
OFFSET

0,5

COMMENT

a((2^n)-1) = 0 for all n.

FORMULA

a(0) = 0, a(n) = product(XORnos(j, floor(j/2)), j=1..n)-n!

CROSSREFS

Cf. A048644.

Sequence in context: A160962 A097783 A078218 this_sequence A111085 A002721 A119217

Adjacent sequences: A048640 A048641 A048642 this_sequence A048644 A048645 A048646

KEYWORD

easy,nonn

AUTHOR

Antti Karttunen, Jul 14 1999

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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