Triangular array read by rows. T(n,k) is the number of labeled transitive relations on [n] that have exactly k symmetric points.

A355783

Triangular array read by rows. T(n,k) is the number of labeled transitive relations on [n] that have exactly k symmetric points.

Terms

    a(0) =1a(1) =2a(2) =0a(3) =12a(4) =0a(5) =1a(6) =152a(7) =0a(8) =18a(9) =1a(10) =3504a(11) =0a(12) =456a(13) =24a(14) =10a(15) =135392a(16) =0a(17) =17520a(18) =760a(19) =600a(20) =31a(21) =8321472a(22) =0a(23) =1015440a(24) =35040a(25) =40560a(26) =2316a(27) =361a(28) =784621952a(29) =0

External references