A123844 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 5x5.

1, 21, 2365, 315227, 46118229, 7130583024, 1146486080898

Offset

1,2

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) 145-152.

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

Crossrefs

Sequence in context: A250062 A219000 A033510 * A172622 A172675 A068254

Adjacent sequences: A123841 A123842 A123843 * A123845 A123846 A123847

Keyword

nonn,hard

Author

Søren Eilers, Oct 29 2006

Status

approved