Number of reversible strings with n labeled beads of 2 colors, no palindromes of more than 1 bead.

A032069

Number of reversible strings with n labeled beads of 2 colors, no palindromes of more than 1 bead.

Terms

    a(0) =2a(1) =2a(2) =12a(3) =144a(4) =1440a(5) =20160a(6) =282240a(7) =4838400a(8) =87091200a(9) =1799884800a(10) =39597465600a(11) =965667225600

External references