334061domain: NAppears in sequencesExpansion of (1-x^2)/(1 - x - 3*x^2 + 2*x^4).at n=17A052933a(n) = number of n-lettered words in the alphabet {1, 2, 3} with as many occurrences of the substring (consecutive subword) [1, 1, 1] as of [1, 1, 2].at n=12A211282