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A123806
Number of ways to build a contiguous building with n LEGO blocks of size 1x7 on top of a fixed block of the same size.
0
62, 5188, 603490, 77670923, 10795814511, 1572624052679
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