891575391

Appears in sequences

• a(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=18A030186
• Number of configurations of the general monomer-dimer model for a 2 X 2n square lattice.at n=9A260033
• a(2*n) = A030186(n), a(2*n+1) = A033505(n).at n=36A365967