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A032205 Number of connected functions on n points with a loop of length 9. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 24 21:47 EDT 2021. Contains 346273 sequences. (Running on oeis4.)