A032205 Number of connected functions on n points with a loop of length 9.

1, 1, 6, 30, 127, 506, 1902, 6823, 23673, 79936, 264036, 856772, 2739525, 8652707, 27049259, 83824636, 257847515, 788121922, 2395786374, 7248517868, 21840785100, 65574504200, 196266067194, 585822825763, 1744384025528, 5183186173513, 15372268502463, 45515472900289

Offset

9,3

Links

Andrew Howroyd, Table of n, a(n) for n = 9..500

C. G. Bower, Transforms (2)

Formula

"CIK[ 9 ]" (necklace, indistinct, unlabeled, 9 parts) transform of A000081.

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

Crossrefs

Column 9 of A339428.

Sequence in context: A337456 A334326 A131458 * A007465 A261389 A073389

Adjacent sequences: A032202 A032203 A032204 * A032206 A032207 A032208

Keyword

nonn

Author

Christian G. Bower

Extensions

Terms a(33) and beyond from Andrew Howroyd, Dec 04 2020

Status

approved