A141415 Number of different virtual strings with n crossings.

1, 0, 0, 2, 26

Offset

0,4

Links

Table of n, a(n) for n=0..4.

Andrew Gibson, On tabulating virtual strings, arXiv:0808.0064 [math.GT], 2008. See Table 2, p. 14.

Vladimir Turaev, Virtual strings and their cobordisms, arXiv:math/0311185 [math.GT], 2008-2014.

Crossrefs

Sequence in context: A369675 A088816 A323589 * A056948 A292359 A035420

Adjacent sequences: A141412 A141413 A141414 * A141416 A141417 A141418

Keyword

nonn,hard,more

Author

Jonathan Vos Post, Aug 04 2008

Status

approved