Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 3 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.
A283432
Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 3 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) =3a(3) =1a(4) =6a(5) =27a(6) =1a(7) =18a(8) =216a(9) =5346a(10) =1a(11) =45a(12) =1701a(13) =134865a(14) =10766601a(15) =1a(16) =135a(17) =15066a(18) =3608550a(19) =871858485a(20) =211829725395a(21) =1a(22) =378a(23) =133407a(24) =96997824a(25) =70607782701a(28) =1a(29) =1134a(30) =1198476a(31) =2616461190
External references
- oeis: A283432