Triangular array read by rows. T(n,k) is the number of functions on n unlabeled nodes that have exactly k unique components (n >= 1, k >= 1).

A217859

Triangular array read by rows. T(n,k) is the number of functions on n unlabeled nodes that have exactly k unique components (n >= 1, k >= 1).

Terms

    a(0) =1a(1) =3a(2) =5a(3) =2a(4) =12a(5) =7a(6) =21a(7) =25a(8) =1a(9) =58a(10) =63a(11) =9a(12) =126a(13) =178a(14) =39a(15) =341a(16) =466a(17) =140a(18) =4a(19) =867a(20) =1253a(21) =470a(22) =25a(23) =2334a(24) =3418a(25) =1431a(26) =135a(27) =6218a(28) =9365a(29) =4358

External references