A045667 Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reverse, inequivalent to complement and reversed complement.

0, 0, 0, 0, 16, 20, 168, 168, 896, 972, 4600, 4840, 20880, 22360, 93744, 99060, 405504, 428876, 1738080, 1828104, 7359600, 7716240, 30982864, 32355664, 129654144, 135002900, 540570160, 561187116, 2245878544, 2325812528

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..200

Crossrefs

Cf. A045662, A045665, A045685.

Formula

a(n) = 2*n*A045685(n).

a(n) = A045662(n) - A045665(n). - Andrew Howroyd, Sep 14 2019