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A030254
Number of nonisomorphic groupoids with 1 idempotent and a nontrivial symmetry.
1
0, 0, 54, 12664
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OFFSET
1,3
LINKS
Table of n, a(n) for n=1..4.
Index entries for sequences related to groupoids
FORMULA
a(n) =
A030253
(n) -
A030271
(n).
CROSSREFS
Column k=1 of
A038020
.
Cf.
A030253
,
A030271
.
Sequence in context:
A299949
A228607
A364304
*
A085482
A084226
A071800
Adjacent sequences:
A030251
A030252
A030253
*
A030255
A030256
A030257
KEYWORD
nonn
,
more
AUTHOR
Christian G. Bower
EXTENSIONS
a(3) corrected by
Andrew Howroyd
, Feb 02 2023
STATUS
approved
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Last modified September 1 12:47 EDT 2024. Contains 375591 sequences. (Running on oeis4.)