56462858429domain: NAppears in sequencesa(n) = (F(3*n+2) - 1)/4, where F=A000045 (the Fibonacci sequence).at n=18A049652a(n) = (F(6*n+2)-1)/4, where F=A000045 (the Fibonacci sequence).at n=9A049662Number of (1,0)-steps of weight 1 at level 0 in all weighted lattice paths in L_n.at n=27A182890