A045668 Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to complement, inequivalent to reverse and reversed complement.
0, 0, 0, 0, 0, 0, 24, 28, 128, 252, 720, 1364, 3360, 6552, 14616, 29040, 61440, 122400, 253008, 504868, 1028160, 2054388, 4149288, 8294444, 16679040, 33349800, 66895920, 133775712, 267976800, 535920696, 1072758840, 2145452092
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..200
Formula
It seems that a(n) = 4*n*A011948(n). - Ralf Stephan, Aug 30 2003
From Andrew Howroyd, Sep 14 2019: (Start)
a(n) = 2*n*A045686(n).