Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is symmetric after a rotation by 180 degrees.
A123763
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is symmetric after a rotation by 180 degrees.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =11a(4) =76a(5) =135a(6) =942a(7) =1812a(8) =12537a(9) =25246a(10) =174019a(11) =362458a(12) =2485725
External references
- oeis: A123763