Number of ways to build a contiguous building with n LEGO blocks of size 2 X 2 on top of a fixed block of the same size.

A123821

Number of ways to build a contiguous building with n LEGO blocks of size 2 X 2 on top of a fixed block of the same size.

Terms

    a(0) =9a(1) =97a(2) =1349a(3) =20288a(4) =329707a(5) =5574248a(6) =97506021a(7) =1747201171a(8) =31923371982a(9) =592403479154

External references