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A030250 Number of nonisomorphic groupoids with no idempotents. 2
1, 0, 3, 978, 56630832, 813802235250650, 4797611106478930201025520, 17327898558894838031017212608777367670, 53493753018329066207577438898229132113128344235601408 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..8.

Index entries for sequences related to groupoids

CROSSREFS

Cf. A001329, A038018.

Sequence in context: A167058 A167067 A151585 * A145231 A167069 A024046

Adjacent sequences:  A030247 A030248 A030249 * A030251 A030252 A030253

KEYWORD

nonn

AUTHOR

Christian G. Bower, Feb 15 1998 and May 15 1998

STATUS

approved

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Last modified December 4 19:31 EST 2016. Contains 278755 sequences.