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A090768 4*7^(n^2+2n+1)*Product_{j=1..n} (49^j-1). 7
28, 460992, 18594942105600, 1801630225452634420838400, 419114092659655895262507217606410240000, 234094442205343557204838431982679810784254737891983360000, 313936710456644712932526713436974934772339799367593873556694922893983744000000, 1010846620958915523772074873493863525346718205399610275113597795065777917926818948851860049494016000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

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).

LINKS

Table of n, a(n) for n=0..7.

G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.

CROSSREFS

Cf. A001309, A003956.

Cf. A092299 and A092301 (p=3), A092300 and A089989 (p=5), A090768 and A090769 (p=7), A090770 (p=2, although this is the wrong formula in that case).

Sequence in context: A180067 A259365 A047680 * A119180 A088844 A234620

Adjacent sequences:  A090765 A090766 A090767 * A090769 A090770 A090771

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 10 2004

STATUS

approved

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Last modified August 20 23:38 EDT 2019. Contains 326155 sequences. (Running on oeis4.)