705705domain: NAppears in sequencesSmallest j with n nodes in its riff (rooted index-functional forest).at n=22A062860a(n) = core(A143176(n)).at n=46A144362a(n) = (15*n^2+45*n-70)*binomial(n+4,6)/8.at n=10A144516Products of 6 distinct odd primes.at n=20A168352Odd abundant numbers that are also doublets (cf. A020338).at n=33A380232