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 A184268 #19 Jan 20 2018 16:14:28 %S A184268 14,362,14624,699600,35792568,1908897152,104715443852,5864063066500, %T A184268 333599974922264,19215358463836552,1117984489446008100, %U A184268 65588423376054708480,3874762242361630560584,230271584688657874664612,13754889325393505198471808,825293359523595646115953700 %N A184268 Number of distinct n X 6 toroidal binary arrays. %H A184268 Vaclav Kotesovec, <a href="/A184268/b184268.txt">Table of n, a(n) for n = 1..550</a> %H A184268 S. N. Ethier, <a href="http://arxiv.org/abs/1301.2352">Counting toroidal binary arrays</a>, arXiv preprint arXiv:1301.2352, 2013 and <a href="https://cs.uwaterloo.ca/journals/JIS/VOL16/Ethier/ethier2.html">J. Int. Seq. 16 (2013) #13.4.7</a> . %F A184268 a(n) ~ 64^n / (6*n). - _Vaclav Kotesovec_, Sep 04 2014 %p A184268 with(numtheory): %p A184268 a:= n-> add(add(phi(c)*phi(d) *2^(6*n/ilcm(c, d)), %p A184268 d=divisors(n)), c=[1,2,3,6])/(6*n): %p A184268 seq(a(n), n=1..25); # _Alois P. Heinz_, Aug 25 2012 %Y A184268 Column 6 of A184271. %K A184268 nonn %O A184268 1,1 %A A184268 _R. H. Hardin_, Jan 10 2011 %E A184268 More terms from _Alois P. Heinz_, Aug 25 2012