Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 10 colors and n>=m, two patterns are in the same class if one of them can be obtained by a reflection or 180-degree rotation of the other.
A286921
Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 10 colors and n>=m, two patterns are in the same class if one of them can be obtained by a reflection or 180-degree rotation of the other.
Terms
- a(0) =1a(1) =1a(2) =10a(3) =1a(4) =55a(5) =2575a(6) =1a(7) =550a(8) =253000a(9) =250525000a(10) =1a(11) =5050a(12) =25007500a(13) =250025500000a(15) =1a(16) =50500a(17) =2500300000a(21) =1a(22) =500500a(23) =250000750000
External references
- oeis: A286921