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A018225 Number of connected chord diagrams of degree n. 0
1, 1, 2, 6, 31, 255, 2788, 37333, 578799, 10134071 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..10.

Alexander Stoimenow, On the number of chord diagrams, Discr. Math. 218 (2000), 209-233.

CROSSREFS

Sequence in context: A275558 A094639 A113719 * A217143 A075845 A003087

Adjacent sequences:  A018222 A018223 A018224 * A018226 A018227 A018228

KEYWORD

nonn

AUTHOR

stoimeno(AT)mail.informatik.hu-berlin.de (Alexander Stoimenow)

STATUS

approved

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Last modified February 23 21:23 EST 2018. Contains 299588 sequences. (Running on oeis4.)