A018192 - OEIS

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A018192

Number of chord diagrams of degree n with an isolated chord.

1, 1, 3, 11, 70, 607, 6577, 85198, 1276563, 21695178, 412195167, 8656676654, 199125735965, 4978810781633, 134447283590269, 3899543151272530, 120903273575624821, 3990362191131712939, 139681113828269665499, 5168844439275046565329

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..20.

D. Bar-Natan, On the Vassiliev Knot Invariants, Topology 34 (1995) 423-472.

D. Bar-Natan, Bibliography of Vassiliev Invariants [Broken link]

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

CROSSREFS

Sequence in context: A121945 A009025 A009103 * A056665 A345030 A378047

Adjacent sequences: A018189 A018190 A018191 * A018193 A018194 A018195

KEYWORD

nonn

AUTHOR

Alexander Stoimenow (stoimeno(AT)math.toronto.edu)

EXTENSIONS

More terms from Sean A. Irvine, Feb 04 2019

STATUS

approved

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