Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 3 which is symmetric after a rotation by 180 degrees.
A123825
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 3 which is symmetric after a rotation by 180 degrees.
Terms
- a(0) =1a(1) =1a(2) =25a(3) =53a(4) =1189a(5) =2947a(6) =66094a(7) =181955a(8) =3979943
External references
- oeis: A123825