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A252784
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Number of exponent-2 class 2 groups of order 2^n.
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3
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0, 0, 1, 3, 7, 22, 89, 779, 30078, 8785772, 48803495722, 1774274116992170
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OFFSET
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0,4
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LINKS
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Table of n, a(n) for n=0..11.
J. H. Conway, Heiko Dietrich and E. A. O'Brien, Counting groups: gnus, moas and other exotica, The Mathematical Intelligencer, March 2008, Volume 30, Issue 2, pp 6-15.
Bettina Eick and E. A. O'Brien, Enumerating p-groups. Group theory. J. Austral. Math. Soc. Ser. A 67 (1999), no. 2, 191-205.
E. A. O'Brien, Bibliography on the determination of finite groups.
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CROSSREFS
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Cf. A000679, A252785, A252786, A252787.
Sequence in context: A000228 A108070 A038147 * A082271 A229438 A069505
Adjacent sequences: A252781 A252782 A252783 * A252785 A252786 A252787
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KEYWORD
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nonn,hard,more
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AUTHOR
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Eric M. Schmidt, Dec 21 2014
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STATUS
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approved
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