Triangle read by rows: T(n,k) is the number of labeled commutative monoids of order n with k idempotents.

A058159

Triangle read by rows: T(n,k) is the number of labeled commutative monoids of order n with k idempotents.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =18a(5) =6a(6) =16a(7) =180a(8) =144a(9) =36a(10) =30a(11) =2040a(12) =3240a(13) =1740a(14) =380a(15) =360a(16) =43170a(17) =81000a(18) =70740a(19) =31680a(20) =6390a(21) =840a(22) =1400112a(23) =2589510a(24) =2976960a(25) =2055480a(26) =832230a(27) =157962a(28) =15360a(29) =110488616

External references