Irregular triangle read by rows: T(n,k) = number of ways to assign n people to d_k unlabeled groups of equal size (where d_k is the k-th divisor of n).

A200473

Irregular triangle read by rows: T(n,k) = number of ways to assign n people to d_k unlabeled groups of equal size (where d_k is the k-th divisor of n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =1a(8) =1a(9) =1a(10) =1a(11) =10a(12) =15a(13) =1a(14) =1a(15) =1a(16) =1a(17) =35a(18) =105a(19) =1a(20) =1a(21) =280a(22) =1a(23) =1a(24) =126a(25) =945a(26) =1a(27) =1a(28) =1a(29) =1

External references