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A289655 Subset of A008989 containing one or more simple loops. 0
0, 1, 2, 5, 18, 74, 371, 2178 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

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

LINKS

Table of n, a(n) for n=0..7.

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.

Sequence in context: A162543 A039744 A319121 * A189281 A006848 A208968

Adjacent sequences:  A289652 A289653 A289654 * A289656 A289657 A289658

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jul 17 2017

STATUS

approved

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Last modified February 15 22:28 EST 2019. Contains 320138 sequences. (Running on oeis4.)