78243

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=10A030186
• Number of matchings in graph P_{10} X P_{n}.at n=2A033513
• Kekulé numbers for certain benzenoids.at n=8A110694
• Triangle T(m,n), read by rows: Number of bipartite labeled graphs (V,E) with vertices A={a_1,...,a_m} and B={b_1,...,b_n} where for any vertex in V at most one edge in E is allowed. Additionally, an edge {a_k,b_l} is allowed only when |k-l|<=1.at n=54A187152
• Number of configurations of the general monomer-dimer model for a 2 X 2n square lattice.at n=5A260033
• a(2*n) = A030186(n), a(2*n+1) = A033505(n).at n=20A365967