5113647domain: NAppears in sequencesNumber of binary words of length n in which the ones occur only in blocks of length at least 4.at n=38A005253Expansion of 1/(1-x^2*(1+x)^3).at n=26A116090Expansion of 1/(1 - x^2/(1-x)^5).at n=16A369803a(n) = Sum_{k=0..floor(3*n/5)} binomial(3*n-3*k,2*k).at n=13A375307