login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A018192 Number of chord diagrams of degree n with an isolated chord. 0
1, 1, 3, 11, 70, 607, 6577, 85198, 1276563, 21695178 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

Bar-Natan, Dror, On the Vassiliev knot invariants. Topology 34, No. 2, 423-472 (1995).

LINKS

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

D. Bar-Natan, Bibliography of Vassiliev Invariants

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

CROSSREFS

Sequence in context: A121945 A009025 A009103 * A056665 A127716 A035378

Adjacent sequences:  A018189 A018190 A018191 * A018193 A018194 A018195

KEYWORD

nonn

AUTHOR

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 22 23:43 EST 2014. Contains 249835 sequences.