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 A184270 #22 Jan 20 2018 16:15:09 %S A184270 36,4150,699252,134223976,27487816992,5864063066500,1286742755471400, %T A184270 288230376353050816,65588423374144427520,15111572745224096425720, %U A184270 3516875111606393874082104,825293359523595646117352176,195023169265881489687952047216 %N A184270 Number of distinct n X 8 toroidal binary arrays. %H A184270 Vaclav Kotesovec, <a href="/A184270/b184270.txt">Table of n, a(n) for n = 1..410</a> %H A184270 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 A184270 a(n) ~ 2^(8*n-3) / n. - _Vaclav Kotesovec_, Sep 04 2014 %p A184270 with(numtheory): %p A184270 a:= n-> add(add(phi(c)*phi(d) *2^(8*n/ilcm(c, d)), %p A184270 d=divisors(n)), c=[1,2,4,8])/(8*n): %p A184270 seq(a(n), n=1..20); # _Alois P. Heinz_, Aug 25 2012 %Y A184270 Column 8 of A184271. %K A184270 nonn %O A184270 1,1 %A A184270 _R. H. Hardin_, Jan 10 2011 %E A184270 More terms from _Alois P. Heinz_, Aug 25 2012