202197domain: NAppears in sequencesa(n+3) = 5*a(n+2)-4*a(n+1)+a(n).at n=10A012880a(1) = 1, a(2) = 2, a(3) = 3, a(n+3) = a(n) + a(n+1).at n=42A084338Number of positive words of length n in the monoid Br_3 of positive braids on 4 strands.at n=14A097550Diagonal sums of Riordan array (1-x-x^2,x(1-x)).at n=46A109266