Triangle read by rows: number of asymmetric monoids of order n with k idempotents.

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =3a(5) =1a(6) =0a(7) =6a(8) =10a(9) =3a(10) =0a(11) =14a(12) =47a(13) =55a(14) =12a(15) =0a(16) =124a(17) =267a(18) =490a(19) =395a(20) =68a(21) =0a(22) =4510a(23) =2230a(24) =4460a(25) =5971a(26) =3324a(27) =502a(28) =0