Square array T(n,m) = Product_{i=0..m} (1+n*i) read by antidiagonals.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =6a(8) =3a(9) =1a(10) =1a(11) =24a(12) =15a(13) =4a(14) =1a(15) =1a(16) =120a(17) =105a(18) =28a(19) =5a(20) =1a(21) =1a(22) =720a(23) =945a(24) =280a(25) =45a(26) =6a(27) =1a(28) =1a(29) =5040