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A123844
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 5x5.
0
1, 21, 2365, 315227, 46118229, 7130583024, 1146486080898
OFFSET
1,2
LINKS
M. Abrahamsen and S. Eilers, On the asymptotic enumeration of LEGO structures, Exper Math. 20 (2) (2011) 145-152.
B. Durhuus and S. Eilers, On the entropy of LEGO, arXiv:math.CO/0504039
CROSSREFS
Sequence in context: A250062 A219000 A033510 * A172622 A172675 A068254
KEYWORD
nonn,hard
AUTHOR
Søren Eilers, Oct 29 2006
STATUS
approved