95173135221domain: NAppears in sequencesa(n) = 3*a(n-1) + a(n-2) - a(n-3) for n >= 3, a(0)=1, a(1)=2, a(2)=7.at n=22A030186Number of configurations of the general monomer-dimer model for a 2 X 2n square lattice.at n=11A260033