A123832 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 3 X 3.

1, 7, 227, 9130, 408081, 19274998, 946866202, 47865420384, 2473743947058

Offset: 1

Author

Søren Eilers, Oct 29 2006

Keywords

• nonn
• hard

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.CO/0504039