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A123847
Number of ways to build a contiguous building with n LEGO blocks of size 5x5 on top of a fixed block of the same size.
0
81, 7981, 1031121, 144390851, 21872530449, 3453512003039
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
LINKS
M. Abrahamsen and S. Eilers, On the asymptotic enumeration of LEGO Structures, Exper. Math. 20 (2) (2011) 145-152
Durhuus and S. Eilers, On the entropy of LEGO, arXiv:math.CO/0504039
CROSSREFS
Sequence in context: A186132 A206504 A046172 * A115443 A328089 A186527
KEYWORD
nonn,hard
AUTHOR
Søren Eilers, Oct 29 2006
STATUS
approved