Array read by rows: T(n,k) is the number of automorphisms of the k-th Abelian group of order n, where the ordering is such that the rows are nondecreasing.

A138565

Array read by rows: T(n,k) is the number of automorphisms of the k-th Abelian group of order n, where the ordering is such that the rows are nondecreasing.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =4a(6) =2a(7) =6a(8) =4a(9) =8a(10) =168a(11) =6a(12) =48a(13) =4a(14) =10a(15) =4a(16) =12a(17) =12a(18) =6a(19) =8a(20) =8a(21) =16a(22) =96a(23) =192a(24) =20160a(25) =16a(26) =6a(27) =48a(28) =18a(29) =8

External references