A134466 See A134457.

0, 1, 1, 2, 6, 6, 11, 22, 44, 92, 92, 157, 311, 622, 1239, 2478, 4956, 9912, 19832, 19832, 36217, 72058, 144061, 288122, 576123, 1152239, 2304478, 4608943

Offset: 1

Author

David W. Wilson, Dec 17 2007

Keywords

• nonn

Comments

Note that a(n) = a(n-1) for n = [1,] 3, 6, 11, 20,... = A006127(2^k + k) (conjectured); this corresponds to the case where the string c (see A134457) satisfies c(n)="0".c(n-1) (pre-pended "0"). The next string c(n+1) is obtained by inserting "0" after the first "1" and adding 1 (except for c(4) where both of these operations are equivalent and only one must be performed). - M. F. Hasler, Dec 17 2007