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A029870 Number of connected functions on n points with a loop of length 7. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 24 05:23 EDT 2021. Contains 346273 sequences. (Running on oeis4.)