Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4 which is symmetric after a rotation by 180 degrees.
A123839
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4 which is symmetric after a rotation by 180 degrees.
Terms
- a(0) =1a(1) =1a(2) =21a(3) =67a(4) =1565a(5) =6241a(6) =137613a(7) =630193a(8) =13136926
External references
- oeis: A123839