Steve Szabo has authored 3 sequences.
A320420
Number of monoids of order n that are not groups.
Original entry on oeis.org
0, 0, 1, 6, 33, 227, 2235, 31558, 1668992
Offset: 0
A318986
Number of loops of order n that are not groups.
Original entry on oeis.org
0, 0, 0, 0, 0, 5, 107, 23745, 106228844, 9365022303538, 20890436195945769615, 1478157455158044452849321015
Offset: 0
- A. Hulpke, Petteri Kaski and Patric R. J. Östergård, The number of Latin squares of order 11, Math. Comp. 80 (2011) 1197-1219.
- Brendan D. McKay, A. Meynert and W. Myrvold, Small Latin Squares, Quasigroups and Loops, J. Combin. Designs 15 (2007), no. 2, 98-119.
- Wikipedia, Quasigroup
- Index entries for sequences related to quasigroups
A318987
Number of semigroups of order n without identity.
Original entry on oeis.org
1, 0, 3, 17, 153, 1687, 26397, 1596113, 3682361420
Offset: 0
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