Number of ways to build a contiguous building with n LEGO blocks of size 3 X 3 on top of a fixed block of the same size.

A123835

Number of ways to build a contiguous building with n LEGO blocks of size 3 X 3 on top of a fixed block of the same size.

Terms

    a(0) =25a(1) =757a(2) =29925a(3) =1281402a(4) =59340183a(5) =2862828262a(6) =142920335981

External references