1922700domain: NAppears in sequencesNumber of planar planted trees with n non-root nodes and without isolated 2-valent nodes.at n=17A061575a(n) = (2^(3*n-1))/(integral_{x=0..1} (1-x^4)^n dx).at n=6A088505Indices of records in A332040.at n=12A332041