Number of ways to build a contiguous building with n LEGO blocks of size 1 X 4 on top of a fixed block of the same size.

A123782

Number of ways to build a contiguous building with n LEGO blocks of size 1 X 4 on top of a fixed block of the same size.

Terms

    a(0) =23a(1) =679a(2) =27591a(3) =1227556a(4) =59212274a(5) =2990304700a(6) =156407426393

External references