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A123790
Number of ways to build a contiguous building with n LEGO blocks of size 1x5 on top of a fixed block of the same size.
0
34, 1516, 93664, 6366476, 468438942, 36108392112, 2882260782674
OFFSET
1,1
COMMENTS
The base block is not counted among the n and must be the only block in the bottom layer of the building
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Søren Eilers, Oct 29 2006
STATUS
approved