Array read by antidiagonals: T(m,n) (m>=1, n>=1) = number of m X n whirlpool permutations.

Terms

a(0) =1a(1) =2a(2) =2a(3) =6a(4) =8a(5) =6a(6) =24a(7) =84a(8) =84a(9) =24a(10) =120a(11) =1632a(12) =5904a(13) =1632a(14) =120a(15) =720a(16) =51040a(17) =1064304a(18) =1064304a(19) =51040a(20) =720a(21) =5040a(22) =2340480a(23) =402671760a(24) =2456909824a(25) =402671760a(26) =2340480a(27) =5040a(28) =40320a(29) =147985824