Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 7 which is symmetric after a rotation by 180 degrees.
A123803
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 7 which is symmetric after a rotation by 180 degrees.
Terms
- a(0) =1a(1) =2a(2) =52a(3) =617a(4) =6052a(5) =86534a(6) =814679a(7) =12560687
External references
- oeis: A123803