Number of inequivalent strings of 2n+1 digits, when 2 strings are equivalent if turning 1 upside down gives the other.

A036255

Number of inequivalent strings of 2n+1 digits, when 2 strings are equivalent if turning 1 upside down gives the other.

Terms

    a(0) =9a(1) =945a(2) =98475a(3) =9961125a(4) =999024375a(5) =99975590625

External references