17973080

Appears in sequences

• Number of bifix-free (or primary, or unbordered) words of length n over a two-letter alphabet.at n=26A003000
• Number of binary words of length n (beginning with 0) whose autocorrelation function is the indicator of a singleton.at n=26A045690
• a(n)/4^n is the measure of the subset of [0,1] remaining when all intervals of the form [b/2^m - 1/2^(2m), b/2^m + 1/2^(2m)] have been removed, with b and m positive integers, b < 2^m and m <= n.at n=13A107284