932131991domain: NAppears in sequencesa(n+3) = 5*a(n+2)-4*a(n+1)+a(n).at n=16A012880Expansion of (1-x)/(1+2*x+x^2+x^3).at n=36A078065Number of positive words of length n in the monoid Br_3 of positive braids on 4 strands.at n=24A097550