A030256 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A030256

Number of nonisomorphic commutative groupoids with a nontrivial symmetry.

0

0, 0, 0, 13, 540, 232767

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

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

Index entries for sequences related to groupoids

CROSSREFS

A001425 - A030255.

Sequence in context: A295942 A297518 A281055 * A023332 A309204 A229263

Adjacent sequences: A030253 A030254 A030255 * A030257 A030258 A030259

KEYWORD

nonn,more

AUTHOR

Christian G. Bower

STATUS

approved