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

Author

Kevin Lamoreau, Mar 10 2023

Keywords

• nonn

Examples

			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.
		

Links

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

Crossrefs

Cf. A090751, A060689, A069513.

Formula

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