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 A045666 #9 Sep 14 2019 18:07:56 %S A045666 0,0,0,0,0,80,384,2352,9856,42840,169280,676720,2630688,10265216, %T A045666 39777248,154498200,599556096,2330826752,9068386320,35332969392, %U A045666 137817005440,538204062984,2103970896544,8233197139552,32247052083840 %N A045666 Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally inequivalent to reverse, complement and reversed complement. %H A045666 Andrew Howroyd, <a href="/A045666/b045666.txt">Table of n, a(n) for n = 0..200</a> %F A045666 a(n) = 2*n*A045684(n). %F A045666 a(n) = A007727(n) - A045662(n) - A045663(n) - A045664(n) + 2*A045665(n). - _Andrew Howroyd_, Sep 14 2019 %Y A045666 Cf. A007727, A045662, A045663, A045664, A045665, A045684. %K A045666 nonn %O A045666 0,6 %A A045666 _David W. Wilson_