181936

Appears in sequences

• Number of spanning trees with degrees 1 and 3 in D_4 X P_n.at n=8A003762
• a(n) = A027082(n, 2n).at n=14A027087
• a(1) = 2; thereafter a(n) is the number obtained by replacing each digit of a(n-1) with its square.at n=5A061588
• Number of symmetric bushes with n edges. I.e., number of ordered trees with n edges, no non-root vertices of outdegree 1 and symmetrical with respect to the vertical axis passing through the root.at n=28A125189