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 A090769 7^(n^2+2n+1)*Product_{j=1..n} (49^j-1). 7
 7, 115248, 4648735526400, 450407556363158605209600, 104778523164913973815626804401602560000, 58523610551335889301209607995669952696063684472995840000, 78484177614161178233131678359243733693084949841898468389173730723495936000000, 252711655239728880943018718373465881336679551349902568778399448766444479481704737212965012373504000000 (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 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: A173839 A122000 A291906 * A013842 A247791 A243859 Adjacent sequences:  A090766 A090767 A090768 * A090770 A090771 A090772 KEYWORD nonn AUTHOR N. J. A. Sloane, Feb 10 2004 STATUS approved

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Last modified January 17 20:36 EST 2020. Contains 330987 sequences. (Running on oeis4.)