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 A045658 #7 Sep 15 2019 19:57:34 %S A045658 0,0,0,0,16,20,168,168,912,972,4620,4840,21064,22360,93912,99080, %T A045658 406416,428876,1739220,1828104,7364236,7716408,30987704,32355664, %U A045658 129676104,135002920,540592520,561188088,2245972472,2325812528 %N A045658 Number of 2n-bead balanced binary strings, rotationally equivalent to reverse, inequivalent to complement and reversed complement. %H A045658 Andrew Howroyd, <a href="/A045658/b045658.txt">Table of n, a(n) for n = 0..200</a> %F A045658 From _Andrew Howroyd_, Sep 15 2019: (Start) %F A045658 Inverse Moebius transform of A045667. %F A045658 a(n) = A045653(n) - A045656(n). (End) %Y A045658 Cf. A045653, A045656, A045667. %K A045658 nonn %O A045658 0,5 %A A045658 _David W. Wilson_