820699domain: NAppears in sequencesNumber of ways of placing n balls into boxes 1,2,... in such a way that any two adjacent boxes contain at least 4 balls.at n=25A257666a(n) = Motzkin(n) - 2^(n - 1 + 0^n) = A001006(n) - A011782(n).at n=16A377659