Triangle read by rows: T(n,k) is the number of labeled monoids of order n with k idempotents and a fixed identity.
A058158
Triangle read by rows: T(n,k) is the number of labeled monoids of order n with k idempotents and a fixed identity.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =4a(6) =4a(7) =45a(8) =72a(9) =35a(10) =6a(11) =528a(12) =1308a(13) =1676a(14) =604a(15) =80a(16) =19935a(17) =39700a(18) =70170a(19) =62060a(20) =16727a(21) =120a(22) =3599436a(23) =1969470a(24) =3829000a(25) =5167800a(26) =3260382a(27) =681232a(28) =2760a(29) =6085914205
External references
- oeis: A058158