Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.
A123797
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 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) =7a(3) =10a(4) =88a(5) =142a(6) =1277a(7) =2193a(8) =19967a(9) =35449a(10) =325809a(11) =593589a(12) =5473435a(13) =10159187a(14) =93929982a(15) =176846933
External references
- oeis: A123797