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A123786
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x5.
0
1, 18, 952, 60878, 4319328, 325354277, 25539764546, 2066227060325
OFFSET
1,2
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Søren Eilers, Oct 29 2006
STATUS
approved