A123812 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.

1, 8, 145, 2884, 62517, 1404472, 32430749, 763219988, 18231473349

Offset: 1

Author

Søren Eilers, Oct 29 2006

Keywords

• nonn
• hard

Crossrefs

Cf. A112389, A123762 - A123827, A123829 - A123849.