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A090770
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2^(n^2+2n+1)*Product_{j=1..n} (4^j-1).
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7
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2, 48, 23040, 185794560, 24257337753600, 50821645356918374400, 1704875112338069448032256000, 915241991059360703024740763172864000, 7861748876453505095791592854589753555681280000, 1080506416218846625176535970968094253434513802154475520000, 2376056471052200653607636735377527394627947719754523173734842368000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| The order of the p-Clifford group for an odd prime p is a*p^(n^2+2n+1)*Product_{j=1..n} (p^(2*j)-1), where a = gcd(p+1,4). This is the sequence obtained by (illegally) setting p = 2.
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LINKS
| G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
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CROSSREFS
| Cf. A001309, A003956.
Cf. A092299 and A092301 (p=3), A092300 and A089989 (p=5), A090768 and A090769 (p=7).
A bisection of A003053, cf. A003923.
Sequence in context: A196448 A053290 A056989 * A081960 A123742 A203311
Adjacent sequences: A090767 A090768 A090769 * A090771 A090772 A090773
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 10 2004
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