Array read by antidiagonals: T(n,k) is the order of the group GL(n,Z_k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =6a(9) =1a(10) =1a(11) =2a(12) =48a(13) =168a(14) =1a(15) =1a(16) =4a(17) =96a(18) =11232a(19) =20160a(20) =1a(21) =1a(22) =2a(23) =480a(24) =86016a(25) =24261120a(26) =9999360a(27) =1a(28) =1a(29) =6