Triangle read by rows: T(n,k) is the number of non-isomorphic colorings of a toroidal n X k grid using exactly four colors under translational symmetry, 1 <= k <= n.
A294686
Triangle read by rows: T(n,k) is the number of non-isomorphic colorings of a toroidal n X k grid using exactly four colors under translational symmetry, 1 <= k <= n.
Terms
- a(0) =0a(1) =0a(2) =6a(3) =0a(4) =260a(5) =20720a(6) =6a(7) =5112a(8) =1223136a(9) =257706024a(10) =48a(11) =81876a(12) =67769552a(13) =54278580036a(15) =260a(16) =1223396a(17) =3731753700a(21) =1200a(22) =17815020a(23) =207438938000a(28) =5106a(29) =257706012
External references
- oeis: A294686