A123798 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 6 on top of a fixed block of the same size.

47, 2944, 256193, 24607451, 2555265136, 278052511951

Offset: 1

Author

Søren Eilers, Oct 29 2006

Keywords

• nonn
• hard

Comments

The base block is not counted among the n and must be the only block in the bottom layer of the building.

Crossrefs

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