A123762 - OEIS

A123762

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2.

1, 4, 37, 375, 4493, 56848, 753536, 10283622, 143607345, 2041497919, 29446248496, 429858432108

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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/0504039 [math.CO], 2005.

B. Durhuus and S. Eilers, On the entropy of LEGO, J. Appl. Math. Comput. 45 (1-2) (2014), 433-448.

S. Eilers, The LEGO counting problem, Amer. Math. Monthly, 123 (May 2016), 415-426.

CROSSREFS

KEYWORD

nonn,hard,more

AUTHOR

STATUS

approved