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%I #8 Jul 21 2017 13:16:17
%S 11,136,1991,30701,500038,8346595,142812582,2481290457,43703296703
%N Number of ways to build a contiguous building with n LEGO blocks of size 1 X 6 on top of a fixed block of the same size so that the building is flat, i.e., with all blocks in parallel position.
%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
%O 1,1
%A _Søren Eilers_, Oct 29 2006
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