Number of ways to build a contiguous building with n LEGO blocks of size 1 X 5 on top of a fixed block of the same size so that the building is flat, i.e., with all blocks in parallel position.
A123792
Number of ways to build a contiguous building with n LEGO blocks of size 1 X 5 on top of a fixed block of the same size so that the building is flat, i.e., with all blocks in parallel position.
Terms
- a(0) =9a(1) =91a(2) =1089a(3) =13726a(4) =182736a(5) =2493062a(6) =34865595a(7) =495114895a(8) =7127585291
External references
- oeis: A123792