38187291

Appears in sequences

• Triangle read by rows: T(n,k) is the number of labeled monoids of order n with k idempotents and a fixed identity.at n=35A058158
• Triangle read by rows: T(n,k) = number of labeled semigroups of order n with k idempotents.at n=27A058166
• Number of labeled idempotent semigroups of order n.at n=7A351730