Table read by antidiagonals: T(n,k) is the number of tilings of the n X k torus up to 180-degree rotation by a tile that is not fixed under 180-degree rotation.

A368308

Table read by antidiagonals: T(n,k) is the number of tilings of the n X k torus up to 180-degree rotation by a tile that is not fixed under 180-degree rotation.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =2a(4) =5a(5) =2a(6) =4a(7) =9a(8) =9a(9) =4a(10) =4a(11) =26a(12) =32a(13) =26a(14) =4a(15) =9a(16) =62a(17) =192a(18) =192a(19) =62a(20) =9a(21) =10a(22) =205a(23) =1096a(24) =2174a(25) =1096a(26) =205a(27) =10a(28) =22a(29) =623

External references