1,2

The base block is not counted among the n and must be the only block in the bottom layer of the building.

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) 145-152.

B. Durhuus and S. Eilers, On the entropy of LEGO, arXiv:math.CO/0504039

Sequence in context: A049743 A033915 A192358 * A040812 A184081 A164011

Adjacent sequences: A123845 A123846 A123847 * A123849 A123850 A123851

nonn,more

Søren Eilers, Oct 29 2006

approved