657169domain: NAppears in sequencesNumber of rooted trees with n nodes and 6 leaves.at n=13A055281a(n) = 2*n^4/3 - 4*n^3/3 + 11*n^2/6 - 13*n/6 + 1.at n=32A345897Numbers k such that omega(k) = 4 and p^omega(k) < k^(1/4) < lpf(k)^(omega(k)+1) for all primes p | k such that p > lpf(k), where lpf = A020639(k).at n=5A383178