
LINKS

Table of n, a(n) for n=1..7.
M. Abrahamsen and S. Eilers, On the asymptotic enumeration of LEGO structures, Exper Math. 20 (2) (2011) 145152.
B. Durhuus and S. Eilers, On the entropy of LEGO, arXiv:math/0504039 [math.CO], 2005.
B. Durhuus and S. Eilers, On the entropy of LEGO, J. Appl. Math. Comput. 45 (12) (2014), 433448.
S. Eilers, The LEGO counting problem, Amer. Math. Monthly, 123 (May 2016), 415426.
