A116655 Number of connected subgroups of the symmetric group S_n.

0, 1, 1, 2, 12, 30, 639, 1835, 64601, 369518, 12351620, 78569754, 5477440592, 35108337731, 3031753084624, 30230571143624, 3308601182539217, 33507627807222128, 5183154493935250901

Offset

0,4

Links

Table of n, a(n) for n=0..18.

N. J. A. Sloane, Transforms

Formula

Logarithmic transform of A005432.

Crossrefs

Labeled version of A005226.

Sequence in context: A197954 A276451 A075352 * A361760 A085892 A101177

Adjacent sequences: A116652 A116653 A116654 * A116656 A116657 A116658

Keyword

nonn,hard

Author

Christian G. Bower, Feb 23 2006

Extensions

a(13)-a(18) added (using data from A005432) by Alois P. Heinz, Dec 04 2018

Status

approved