144364domain: NAppears in sequencesa(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 189) or the same sequence for the mesh patterns (12, 243), (12, 378), (12, 414).at n=12A289595Numbers that are primitive Zumkeller, but not primitive non-deficient.at n=37A378657