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A030255 Number of nonisomorphic commutative groupoids with no symmetry. 2
1, 1, 4, 116, 43428, 254197133 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..5.

Index entries for sequences related to groupoids

CROSSREFS

a(n) = A079185(n, A027423(n)). Cf. A001425.

Sequence in context: A198080 A272158 A194535 * A146508 A096464 A285053

Adjacent sequences:  A030252 A030253 A030254 * A030256 A030257 A030258

KEYWORD

nonn,more

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified January 22 07:31 EST 2022. Contains 350481 sequences. (Running on oeis4.)