Triangle read by rows: T(n,k) is the number of subgroups of S_n isomorphic to S_k, where S_n is the n-th symmetric group.

A378163

Triangle read by rows: T(n,k) is the number of subgroups of S_n isomorphic to S_k, where S_n is the n-th symmetric group.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =9a(8) =4a(9) =1a(10) =1a(11) =25a(12) =20a(13) =5a(14) =1a(15) =1a(16) =75a(17) =160a(18) =60a(19) =12a(20) =1a(21) =1a(22) =231a(23) =910a(24) =560a(25) =84a(26) =7a(27) =1a(28) =1a(29) =763

External references