A029869 Number of connected functions on n points with a loop of length 6.

1, 1, 5, 18, 63, 206, 671, 2087, 6434, 19472, 58375, 173316, 511452, 1500697, 4386021, 12775455, 37118209, 107621858, 311552351, 900775893, 2601887149, 7510011727, 21664873773, 62473966631, 180104101037, 519126161517, 1496177366884, 4312044894059, 12427896986697

Offset

6,3

Links

Andrew Howroyd, Table of n, a(n) for n = 6..500

C. G. Bower, Transforms

Formula

"CIK[ 6 ]" (necklace, indistinct, unlabeled, 6 parts) transform of A000081.

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

Crossrefs

Column 6 of A339428.

Sequence in context: A113301 A111567 A121050 * A033453 A284840 A301749

Adjacent sequences: A029866 A029867 A029868 * A029870 A029871 A029872

Keyword

nonn

Author

Christian G. Bower

Extensions

Terms a(31) and beyond from Andrew Howroyd, Dec 08 2020

Status

approved