57022domain: NAppears in sequencesNumber of asymmetric mobiles (circular rooted trees) with n nodes and 3 leaves.at n=38A055364Signed recurrence over strict trees: a(n) = -1 + Sum_{y1 + ... + yk = n, y1 > ... > yk > 0, k > 1} a(y1) * ... * a(yk).at n=28A300864