Triangular array read by rows. T(n,k) is the number of idempotent binary relations on [n] having no proper power primitive (A360718) with exactly k irreflexive points.

A370208

Triangular array read by rows. T(n,k) is the number of idempotent binary relations on [n] having no proper power primitive (A360718) with exactly k irreflexive points.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =13a(6) =39a(7) =87a(8) =348a(9) =24a(10) =841a(11) =4205a(12) =480a(13) =11643a(14) =69858a(15) =9420a(16) =240a(17) =227893a(18) =1595251a(19) =206640a(20) =9240a(21) =6285807a(22) =50286456a(23) =5389552a(24) =299040a(25) =3360a(26) =243593041a(27) =2192337369a(28) =172041408a(29) =9848160

External references