Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.
A123789
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =7a(4) =49a(5) =77a(6) =572a(7) =949a(8) =7245a(9) =12361a(10) =96063a(11) =167564a(12) =1313467a(13) =2327488a(14) =18365795a(15) =32936281a(16) =261111133a(17) =472694546
External references
- oeis: A123789