%I #19 Jan 20 2018 16:14:07
%S 8,108,2192,52488,1342208,35792568,981706832,27487816992,781874936816,
%T 22517998808448,655069036708592,19215358428046176,567592125344909792,
%U 16865594582168158776,503719091506096394752,15111572745196608608736,455125014443154512836736
%N Number of distinct n X 5 toroidal binary arrays.
%H Vaclav Kotesovec, <a href="/A184267/b184267.txt">Table of n, a(n) for n = 1..660</a>
%H 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 a(n) ~ 32^n / (5*n). - _Vaclav Kotesovec_, Sep 04 2014
%p with(numtheory):
%p a:= n-> add(add(phi(c)*phi(d) *2^(5*n/ilcm(c, d)),
%p d=divisors(n)), c=[1,5])/(5*n):
%p seq(a(n), n=1..25); # _Alois P. Heinz_, Aug 25 2012
%Y Column 5 of A184271.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 10 2011
%E More terms from _Alois P. Heinz_, Aug 25 2012