A289655 Subset of A008989 containing one or more simple loops.

0, 1, 2, 5, 18, 74, 371, 2178

Offset: 0

Author

N. J. A. Sloane, Jul 17 2017

Keywords

• nonn
• more

Comments

It appears (although it is not certain) that A268571(n) = A008989(n) - a(n).

Links

• Guy Valette, A Classification of Spherical Curves Based on Gauss Diagrams, Arnold Math. J. (2016) 2:383-405, DOI 10.1007/s40598-016-0049-3.

Crossrefs

Cf. A008989, A268571.