A104252 Number of oriented prime alternating tangles.

1, 2, 7, 29, 137, 679, 3515, 18677, 101463, 560062, 3132639, 17708417, 100998567, 5803646663, 3356435363, 19519575163

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