A130629 Number of virtual knots of crossing number n, counting only classical crossings. Mirror images and inverses are not distinguished.

1, 0, 1, 7, 108, 2448, 90234

Offset

0,4

Links

Table of n, a(n) for n=0..6.

Benjamin A. Burton, Virtual knot tables.

Jeremy Green, virtual knot table.

Louis Kauffman, Virtual knot theory, arXiv:math/9811028 [math.GT], 1998-2006.

Louis Kauffman, Virtual knot theory, European J. Comb. (1999) Vol. 20, 663-690.

Crossrefs

Sequence in context: A297804 A218819 A033516 * A137648 A106977 A142480

Adjacent sequences: A130626 A130627 A130628 * A130630 A130631 A130632

Keyword

nonn,more

Author

Chan-Ho Suh (suh(AT)math.ucdavis.edu), Aug 11 2007

Extensions

a(6) corrected (from 90235) by Andrei Zabolotskii, Jan 31 2026, per Burton.

Status

approved