A361414 Number of non-abelian indecomposable groups of order n.

0, 0, 0, 0, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 7, 0, 2, 0, 2, 1, 1, 0, 6, 0, 1, 2, 1, 0, 1, 0, 33, 0, 1, 0, 4, 0, 1, 1, 5, 0, 2, 0, 1, 0, 1, 0, 23, 0, 2, 0, 2, 0, 6, 1, 5, 1, 1, 0, 3, 0, 1, 1, 200, 0, 1, 0, 2, 0, 1, 0, 19, 0, 1, 1, 1, 0, 2, 0, 24, 8, 1, 0, 3, 0

Offset

1,8

Links

Kevin Lamoreau, Table of n, a(n) for n = 1..2047

Formula

a(n) = A090751(n) - A069513(n).

Example

a(16) = 7 because 1 of the 8 indecomposable groups of order 16 is abelian and 2 of the 9 non-abelian groups of order 16 are decomposable, leaving 7 non-abelian indecomposable groups of order 16.

Crossrefs

Cf. A090751, A060689, A069513.

Sequence in context: A363879 A366767 A113686 * A193403 A354272 A039997

Adjacent sequences: A361411 A361412 A361413 * A361415 A361416 A361417

Keyword

nonn

Author

Kevin Lamoreau, Mar 10 2023

Status

approved