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

0,5

COMMENTS

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

LINKS

Table of n, a(n) for n=0..20.

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 * A111085 A002721 A119217

Adjacent sequences:  A048640 A048641 A048642 * A048644 A048645 A048646

KEYWORD

easy,nonn

AUTHOR

Antti Karttunen, Jul 14 1999

STATUS

approved

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Last modified May 23 02:23 EDT 2013. Contains 225585 sequences.