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%I #11 May 28 2016 10:26:15
%S 1,1,1,7,13,19,25,209,571
%N Number of ways to build a contiguous building with n LEGO blocks of size 4 X 4 on top of a fixed block of the same size so that the building is symmetric after a rotation by 90 degrees.
%C The base block is not counted among the n and must be the only block in the bottom layer of the building.
%H M. Abrahamsen and S. Eilers, <a href="http://dx.doi.org/10.1080/10586458.2011.564539">On the asymptotic enumeration of LEGO structures</a>, Exper Math. 20 (2) (2011) 145-152.
%H B. Durhuus and S. Eilers, <a href="http://arxiv.org/abs/math/0504039">On the entropy of LEGO</a>, arXiv:math/0504039 [math.CO], 2005.
%H S. Eilers, <a href="http://www.math.ku.dk/~eilers/lego.html">A LEGO Counting problem</a>, 2005.
%K nonn,more
%O 1,4
%A _Søren Eilers_, Oct 29 2006
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