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A030271 Number of nonisomorphic groupoids with 1 idempotent and no symmetry. 5
1, 4, 1431, 75491208 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..4.

Index entries for sequences related to groupoids

CROSSREFS

Sequence in context: A278844 A036107 A201390 * A301576 A160088 A094546

Adjacent sequences:  A030268 A030269 A030270 * A030272 A030273 A030274

KEYWORD

nonn,more

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified March 29 17:23 EDT 2020. Contains 333116 sequences. (Running on oeis4.)