A060689 - OEIS

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A060689

Number of nonabelian groups of order n.

0, 0, 0, 0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 9, 0, 3, 0, 3, 1, 1, 0, 12, 0, 1, 2, 2, 0, 3, 0, 44, 0, 1, 0, 10, 0, 1, 1, 11, 0, 5, 0, 2, 0, 1, 0, 47, 0, 3, 0, 3, 0, 12, 1, 10, 1, 1, 0, 11, 0, 1, 2, 256, 0, 3, 0, 3, 0, 3, 0, 44, 0, 1, 1, 2, 0, 5, 0, 47, 10, 1, 0, 13, 0, 1, 0, 9, 0, 8, 0, 2

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OFFSET

1,8

COMMENTS

a(n) = 0 iff n belongs to sequence A051532.

LINKS

Andrey Zabolotskiy, Table of n, a(n) for n = 1..2047 [terms up to a(2015) from T. D. Noe, a(1024) corrected by Andrey Zabolotskiy]

Index entries for sequences related to groups

FORMULA

a(n) = A000001(n) - A000688(n).

EXAMPLE

a(6) = 1 because the only non-Abelian group of order 6 is the symmetric group S_3.