Table read by antidiagonals: T(n,k) = number of distinct n X k toroidal 0..5 arrays.

Terms

a(0) =6a(1) =21a(2) =21a(3) =76a(4) =351a(5) =76a(6) =336a(7) =7826a(8) =7826a(9) =336a(10) =1560a(11) =210456a(12) =1119936a(13) =210456a(14) =1560a(15) =7826a(16) =6047412a(17) =181402676a(18) =181402676a(19) =6047412a(20) =7826a(21) =39996a(22) =181410426a(23) =31345666736a(24) =176319685116a(25) =31345666736a(26) =181410426a(27) =39996a(28) =210126a(29) =5597460306