A030253 Number of nonisomorphic groupoids with 1 idempotent.

1, 4, 1485, 75503872, 1017252851596875, 5757133327963849592814528, 20215881652044379995902152075055222830, 61135717735233219050448568789931104340315383312314368, 211183533479322240072330407564487674164933356945958938913349187272951385

Offset

1,2

Links

Andrew Howroyd, Table of n, a(n) for n = 1..25

Index entries for sequences related to groupoids

Crossrefs

Column k=1 of A038018.

Sequence in context: A094546 A203035 A391979 * A278549 A229664 A361449

Adjacent sequences: A030250 A030251 A030252 * A030254 A030255 A030256

Keyword

nonn

Author

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

Status

approved