A112389 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 4.
1, 24, 1560, 119580, 10166403, 915103765, 85747377755, 8274075616387, 816630819554486, 82052796578652749
Offset: 1
References
- Anthony Lane, The Joy of Bricks, The New Yorker, Apr 27-May 04, 1998, pp. 96-103.
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.
- S. Eilers and M. Abrahamsen, Efficient counting of LEGO structures, March 30 2007.
- Index entry for sequences related to LEGO blocks.
Extensions
a(8) from Søren Eilers, Oct 29 2006
a(9) from Johan Nilsson, Jan 06 2014
a(10) from Matthias Simon, Apr 06 2018
Comments