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A123832
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 3 X 3.
0
1, 7, 227, 9130, 408081, 19274998, 946866202, 47865420384, 2473743947058
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..9.
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:
A303533
A372967
A142606
*
A093167
A157693
A221029
Adjacent sequences:
A123829
A123830
A123831
*
A123833
A123834
A123835
KEYWORD
nonn
,
hard
AUTHOR
Søren Eilers
, Oct 29 2006
STATUS
approved
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Last modified July 10 03:08 EDT 2024. Contains 374194 sequences. (Running on oeis4.)