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A076019 Number of nonisomorphic commutative systems with n elements with one binary operation satisfying the equation B(AB)=A (totally-symmetric quasigroups). 3
1, 1, 2, 2, 1, 3, 3, 13, 12, 139, 65, 25894, 24316, 92798256, 122859802 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..15.

Brendan D. McKay and Ian M. Wanless, Enumeration of Latin squares with conjugate symmetry, J. Combin. Des. 30 (2022), 105-130.

CROSSREFS

Cf. A076016-A076021.

Sequence in context: A167754 A011020 A181512 * A071453 A212306 A339708

Adjacent sequences:  A076016 A076017 A076018 * A076020 A076021 A076022

KEYWORD

nonn,hard,more

AUTHOR

Richard C. Schroeppel, Oct 29 2002

EXTENSIONS

a(10)-a(15) from Ian Wanless, Dec 08 2021

STATUS

approved

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Last modified October 7 04:30 EDT 2022. Contains 357270 sequences. (Running on oeis4.)