67366

Appears in sequences

• Number of planar planted trees with n non-root nodes and without isolated 2-valent nodes.at n=14A061575
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 0), (0, -1, 1), (0, 0, 1), (1, 0, -1)}.at n=11A148321
• a(n) = Sum_{k=1..n} k^2 * tau(k)^2, where tau is A000005.at n=21A320897