Square array read by antidiagonals: T(n,k) is the number of relations between set A with n elements and set B with k elements that are both right unique and left unique.

A329655

Square array read by antidiagonals: T(n,k) is the number of relations between set A with n elements and set B with k elements that are both right unique and left unique.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =6a(5) =3a(6) =4a(7) =12a(8) =12a(9) =4a(10) =5a(11) =20a(12) =33a(13) =20a(14) =5a(15) =6a(16) =30a(17) =72a(18) =72a(19) =30a(20) =6a(21) =7a(22) =42a(23) =135a(24) =208a(25) =135a(26) =42a(27) =7a(28) =8a(29) =56

External references