%I #7 Feb 15 2025 15:28:17
%S 34,1516,93664,6366476,468438942,36108392112,2882260782674
%N 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.
%C The base block is not counted among the n and must be the only block in the bottom layer of the building.
%Y Cf. A112389, A123762 - A123827, A123829 - A123849.
%K nonn,hard,changed
%O 1,1
%A _Søren Eilers_, Oct 29 2006