A090600 - cp's OEIS frontend

A090600 Number of n-element groupoids with an identity, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

n	a(n)
1	1
2	2
3	30
4	22456
5	3179460875
6	118459556737869096
7	1841479754519556293280702095
8	17699004125822025124951660289473617122688
9	146207646053305863964379580591072585873215024249550168360

[1, 2, 30, 22456, 3179460875, 118459556737869096, 1841479754519556293280702095, 17699004125822025124951660289473617122688, 146207646053305863964379580591072585873215024249550168360]

cp's OEIS Frontend

A090600 Number of n-element groupoids with an identity, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Table of values

List of values