Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 4 which is symmetric after a rotation by 180 degrees.

A123829

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 4 which is symmetric after a rotation by 180 degrees.

Terms

    a(0) =1a(1) =2a(2) =44a(3) =185a(4) =3276a(5) =15682a(6) =282377a(7) =1480410a(8) =26264942

External references