Number of ways to build a contiguous building with n LEGO blocks of size 5 X 5 on top of a fixed block of the same size.

A123847

Number of ways to build a contiguous building with n LEGO blocks of size 5 X 5 on top of a fixed block of the same size.

Terms

    a(0) =81a(1) =7981a(2) =1031121a(3) =144390851a(4) =21872530449

External references