A283841 Number of ternary maps f : S X S X S -> S on a set S of n elements which can be represented as a superposition of binary maps * : S X S -> S (Version 2).

1, 21, 38472

Offset

1,2

Comments

That is, the number of ternary maps represented either in the form f(x, y, z) = (x ∗ y) ∗ z or in the form f(x, y, z) = x ∗ (y ∗ z).

Links

Table of n, a(n) for n=1..3.

Pasha Zusmanovich, Lie algebras and around: selected questions, arXiv:1608.05863 [math.RA], 2016.

Crossrefs

Cf. A283840.

Sequence in context: A299035 A189648 A351804 * A100414 A189310 A068735

Adjacent sequences: A283838 A283839 A283840 * A283842 A283843 A283844

Keyword

nonn,bref,more

Author

N. J. A. Sloane, Mar 25 2017

Status

approved