Triangle read by rows: T(n,k) is the number of non-isomorphic colorings of a toroidal n X k grid using exactly two colors under translational symmetry, 1 <= k <= n.

A294684

Triangle read by rows: T(n,k) is the number of non-isomorphic colorings of a toroidal n X k grid using exactly two colors under translational symmetry, 1 <= k <= n.

Terms

    a(0) =0a(1) =1a(2) =5a(3) =2a(4) =12a(5) =62a(6) =4a(7) =38a(8) =350a(9) =4154a(10) =6a(11) =106a(12) =2190a(13) =52486a(14) =1342206a(15) =12a(16) =360a(17) =14622a(18) =699598a(19) =35792566a(20) =1908897150a(21) =18a(22) =1180a(23) =99878a(24) =9587578a(25) =981706830a(26) =104715443850a(28) =34a(29) =4148a(30) =699250

External references