A079172 - OEIS

A079172

Number of non-associative closed binary operations on a set of order n.

0, 8, 19570, 4294963804, 298023223876769393, 10314424798490535546154887938, 256923577521058878088611477224227878265543, 6277101735386680763835789423207666416102355296268686994710, 196627050475552913618075908526912116283103450944214766927276968172610579252347

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OFFSET

1,2

COMMENTS

Each a(n) is equal to the sum of the products of each element in row n of A079174 and the corresponding element of A079210.

LINKS

Table of n, a(n) for n=1..9.

C. van den Bosch, Closed binary operations on small sets

Index entries for sequences related to groupoids

FORMULA

a(n) = A002489(n) - A023814(n).

CROSSREFS