A252784 Number of exponent-2 class 2 groups of order 2^n.

0, 0, 1, 3, 7, 22, 89, 779, 30078, 8785772, 48803495722, 1774274116992170

Offset

0,4

Links

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.

Crossrefs

Cf. A000679, A252785, A252786, A252787.

Sequence in context: A000228 A108070 A038147 * A364627 A082271 A229438

Adjacent sequences: A252781 A252782 A252783 * A252785 A252786 A252787

Keyword

nonn,hard,more

Author

Eric M. Schmidt, Dec 21 2014

Status

approved