A058143 Number of commutative monoids of order n with 2 idempotents.

1, 3, 9, 26, 98, 455, 4018, 101910, 10054303

Offset

2,2

Links

Table of n, a(n) for n=2..10.

Index entries for sequences related to monoids

Crossrefs

Column 2 of A058142.

Sequence in context: A148921 A148922 A148923 * A126025 A317497 A114181

Adjacent sequences: A058140 A058141 A058142 * A058144 A058145 A058146

Keyword

nonn,more

Author

Christian G. Bower, Nov 14 2000

Extensions

a(8)-a(10) from Andrew Howroyd, Feb 15 2022

Status

approved