Triangle read by rows: T(n,k) is the number of endofunctions on [n] whose second-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-1).

A350079

Triangle read by rows: T(n,k) is the number of endofunctions on [n] whose second-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-1).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =1a(4) =17a(5) =1a(6) =9a(7) =142a(8) =19a(9) =27a(10) =68a(11) =1569a(12) =201a(13) =135a(14) =510a(15) =710a(16) =21576a(17) =2921a(18) =3465a(19) =2890a(20) =6390a(21) =9414a(22) =355081a(23) =50233a(24) =63630a(25) =20230a(26) =84490a(27) =98847a(28) =151032a(29) =6805296

External references