Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 5 X 5 which is symmetric after a rotation by 180 degrees.
A123845
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 5 X 5 which is symmetric after a rotation by 180 degrees.
Terms
- a(0) =1a(1) =1a(2) =29a(3) =143a(4) =3497a(5) =22303a(6) =503847a(7) =3778105
External references
- oeis: A123845