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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: A064641 A183608 A307389 * 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 December 2 04:17 EST 2023. Contains 367506 sequences. (Running on oeis4.)