Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 8 which is flat, i.e., with all blocks in parallel position, and symmetric after a rotation by 180 degrees.
A123813
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 8 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) =9a(3) =13a(4) =153a(5) =249a(6) =3011a(7) =5209a(8) =63991a(9) =114321a(10) =1421173a(11) =2603433a(12) =32518012a(13) =60650817a(14) =760402013a(15) =1437977218
External references
- oeis: A123813