Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 9 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.
A286920
Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 9 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) =9a(3) =1a(4) =45a(5) =1701a(6) =1a(7) =405a(8) =134865a(9) =97135605a(10) =1a(11) =3321a(12) =10766601a(13) =70618411521a(15) =1a(16) =29889a(17) =871858485a(21) =1a(22) =266085a(23) =70607782701
External references
- oeis: A286920