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A178432 Number of isomorphism classes of kei (involutary quandles) of order n. 2
1, 1, 1, 3, 5, 13, 41, 142, 665, 4288, 36455 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

M. Takasaki, Abstractions of symmetric functions, Tohoku Math. J., 49 (1943), 143-207.

LINKS

Table of n, a(n) for n=0..10.

P. Jedlicka, A. Pilitowska, D. Stanovsky et al., The structure of medial quandles, arXiv preprint 1409.8396 [math.GR], 2014.

David Joyce, A classifying invariant of knots, the knot quandle, J. Pure Appl. Algebra 23 (1982) 37-65.

Sam Nelson, Quandles and Racks

CROSSREFS

Cf. A181769.

Sequence in context: A271667 A188583 A259932 * A236068 A057188 A128548

Adjacent sequences:  A178429 A178430 A178431 * A178433 A178434 A178435

KEYWORD

nonn,hard,more

AUTHOR

James McCarron, Dec 21 2010

STATUS

approved

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Last modified November 17 03:06 EST 2019. Contains 329216 sequences. (Running on oeis4.)