A089797 Number of rational knots and links with unknotting (unlinking) number U=1.

1, 1, 1, 2, 3, 4, 6, 9, 15, 19, 30, 39, 63, 79, 126, 159, 255

Offset

2,4

Links

Table of n, a(n) for n=2..18.

Jablan S., Ordering Knots

Jablan S. and Sazdanovic R., LinKnot

P. Kohn, Two-bridge links with unlinking number one, Proc. Amer. Math. Soc. 113 (1991), 1135-1147.

A. Stoimenow, Generating Functions, Fibonacci Numbers and Rational Knots, arXiv:math/0210174 [math.GT], 2002.

Crossrefs

Cf. A078477.

Sequence in context: A173289 A096824 A192488 * A081237 A022159 A022161

Adjacent sequences: A089794 A089795 A089796 * A089798 A089799 A089800

Keyword

nonn,more

Author

Slavik Jablan and Radmila Sazdanovic, Jan 09 2004

Status

approved