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A104252 Number of oriented prime alternating tangles. 0
1, 2, 7, 29, 137, 679, 3515, 18677, 101463, 560062, 3132639, 17708417, 100998567, 5803646663, 3356435363, 19519575163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

P. Zinn-Justin and J.-B. Zuber, On the counting of colored tangles

CROSSREFS

Sequence in context: A074600 A064641 A183608 * A018977 A190736 A265000

Adjacent sequences:  A104249 A104250 A104251 * A104253 A104254 A104255

KEYWORD

nonn,hard

AUTHOR

Ralf Stephan, Feb 27 2005

STATUS

approved

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Last modified October 15 09:40 EDT 2018. Contains 316211 sequences. (Running on oeis4.)