Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 2.

A123818

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 2.

Terms

    a(0) =1a(1) =3a(2) =31a(3) =412a(4) =6435a(5) =106108a(6) =1825803a(7) =32320892a(8) =584956651a(9) =10772558067a(10) =201219520632

External references