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 A045660 #7 Sep 15 2019 19:57:52 %S A045660 0,0,0,12,32,120,300,784,1824,4296,9720,21824,47852,104832,226576, %T A045660 487392,1042208,2219520,4703880,9942016,20940152,43995544,92206400, %U A045660 192843776,402500844,838655520,1744509312,3623427624,7515501648 %N A045660 Number of 2n-bead balanced binary strings, rotationally equivalent to reversed complement, inequivalent to reverse and complement. %H A045660 Andrew Howroyd, <a href="/A045660/b045660.txt">Table of n, a(n) for n = 0..200</a> %F A045660 From _Andrew Howroyd_, Sep 15 2019: (Start) %F A045660 Inverse Moebius transform of A045669. %F A045660 a(n) = A045655(n) - A045656(n). (End) %Y A045660 Cf. A045655, A045656, A045669. %K A045660 nonn %O A045660 0,4 %A A045660 _David W. Wilson_