25385domain: NAppears in sequencesNumber of ordered factorizations with 3 levels of parentheses indexed by prime signatures: A050358(A025487(n)).at n=28A050359Expansion of 1/(1-2*x-3*x^2-3*x^3).at n=9A077832Numbers that are the product of two distinct primes and they are partial sum of products of two distinct primes.at n=32A168476