This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A112389 #59 Jun 01 2024 11:14:02 %S A112389 1,24,1560,119580,10166403,915103765,85747377755,8274075616387, %T A112389 816630819554486,82052796578652749 %N A112389 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 4. %C A112389 a(6) is often quoted as 102981500, but this is incorrect. %D A112389 Anthony Lane, The Joy of Bricks, The New Yorker, Apr 27-May 04, 1998, pp. 96-103. %H A112389 M. Abrahamsen and S. Eilers, <a href="http://dx.doi.org/10.1080/10586458.2011.564539">On the asymptotic enumeration of LEGO structures</a>, Exper. Math. 20 (2) (2011) 145-152. %H A112389 B. Durhuus and S. Eilers, <a href="http://arxiv.org/abs/math/0504039">On the entropy of LEGO</a>, arXiv:math/0504039 [math.CO], 2005. %H A112389 B. Durhuus and S. Eilers, <a href="http://dx.doi.org/10.1007/s12190-013-0730-9">On the entropy of LEGO</a>, J. Appl. Math. Comput. 45 (1-2) (2014), 433-448. %H A112389 S. Eilers, <a href="http://www.jstor.org/stable/10.4169/amer.math.monthly.123.5.415">The LEGO counting problem</a>, Amer. Math. Monthly, 123 (May 2016), 415-426. %H A112389 S. Eilers and M. Abrahamsen, <a href="http://www.math.ku.dk/~eilers/papers/eclbii.pdf">Efficient counting of LEGO structures</a>, March 30 2007. %H A112389 <a href="/wiki/Index_to_OEIS:_Section_Lc#LEGO">Index entry for sequences related to LEGO blocks</a>. %Y A112389 Cf. A112390, A272690. %K A112389 nonn,hard,more %O A112389 1,2 %A A112389 _N. J. A. Sloane_, Dec 06 2005 %E A112389 Thanks to _Gerald McGarvey_, _Christian Schroeder_ and _Jud McCranie_, who contributed to this entry. %E A112389 a(8) from _Søren Eilers_, Oct 29 2006 %E A112389 a(9) from _Johan Nilsson_, Jan 06 2014 %E A112389 a(10) from _Matthias Simon_, Apr 06 2018