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

0,7

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).

a(n) = A045663(n) - A045665(n). (End)

Crossrefs

Cf. A011948, A045663, A045665, A045686.

Sequence in context: A107406 A206261 A217441 * A045659 A319901 A058228

Adjacent sequences: A045665 A045666 A045667 * A045669 A045670 A045671

Keyword

nonn

Author

David W. Wilson

Status

approved