Number of binary pattern classes in the (2,n)-rectangular grid: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.
A225826
Number of binary pattern classes in the (2,n)-rectangular grid: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =24a(4) =76a(5) =288a(6) =1072a(7) =4224a(8) =16576a(9) =66048a(10) =262912a(11) =1050624a(12) =4197376a(13) =16785408a(14) =67121152a(15) =268468224a(16) =1073790976a(17) =4295098368a(18) =17180065792a(19) =68720001024a(20) =274878693376
External references
- oeis: A225826