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A003931
Order of universal Chevalley group B_2(q), q = prime power.
2
720, 51840, 979200, 9360000, 276595200, 1056706560, 3443212800, 25721308800, 137037962880, 1095199948800, 2008994088960, 6114035779200, 41348052472320, 95214600000000, 205608315669120, 420206392771200, 818774509363200, 1124799322521600, 4805069329111680, 13414669637644800
OFFSET
1,1
REFERENCES
J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985 [for best online version see https://oeis.org/wiki/Welcome#Links_to_Other_Sites], p. xvi.
H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.
LINKS
FORMULA
a(n) = B(A000961(n + 1), 2) where B(q,n) is defined in A003920. - Sean A. Irvine, Sep 22 2015
PROG
(Magma) [#SymplecticGroup(4, q) : q in [2..50] | IsPrimePower(q)]; // Robin Visser, Aug 06 2023
CROSSREFS
Sequence in context: A291113 A246217 A364771 * A158049 A294705 A222004
KEYWORD
nonn,easy
EXTENSIONS
More terms from Robin Visser, Aug 06 2023
STATUS
approved