A029870 Number of connected functions on n points with a loop of length 7.

1, 1, 5, 21, 80, 285, 970, 3192, 10236, 32197, 99743, 305276, 925342, 2783012, 8316994, 24726109, 73195582, 215911767, 635028054, 1863156727, 5455350409, 15946267328, 46545783253, 135702643984, 395246786050, 1150250414764, 3345193851398, 9723141517918

Offset

7,3

Links

Andrew Howroyd, Table of n, a(n) for n = 7..500

C. G. Bower, Transforms

Formula

"CIK[ 7 ]" (necklace, indistinct, unlabeled, 7 parts) transform of A000081.

a(n) ~ A187770 * A051491^n / n^(3/2). - Vaclav Kotesovec, Dec 25 2020

Crossrefs

Column 7 of A339428.

Sequence in context: A244198 A186244 A255447 * A269915 A273393 A231430

Adjacent sequences: A029867 A029868 A029869 * A029871 A029872 A029873

Keyword

nonn

Author

Christian G. Bower

Extensions

Terms a(32) and beyond from Andrew Howroyd, Dec 04 2020

Status

approved