Triangular array read by rows. T(n,k) is the number of inequivalent (as defined below) transitive binary relations R on [n] such that |domain(R intersect R^(-1))| = k, n>=0, 0<=k<=n.

A369776

Triangular array read by rows. T(n,k) is the number of inequivalent (as defined below) transitive binary relations R on [n] such that |domain(R intersect R^(-1))| = k, n>=0, 0<=k<=n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =4a(6) =19a(7) =9a(8) =12a(9) =29a(10) =219a(11) =76a(12) =72a(13) =116a(14) =355a(15) =4231a(16) =1095a(17) =760a(18) =870a(19) =1775a(20) =6942a(21) =130023a(22) =25386a(23) =13140a(24) =11020a(25) =15975a(26) =41652a(27) =209527a(28) =6129859a(29) =910161

External references