A058130 Number of asymmetric monoids (semigroups with identity) of order n.
1, 2, 4, 19, 128, 1344, 20997, 1479686
Offset: 1
Extensions
a(8) from Christian G. Bower, Dec 26 2006
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.