-2363domain: ZAppears in sequencesa(n) = a(n-1) - (n-4)*a(n-4), with a(0)=0, a(1)=1, a(2)=2, a(3)=1.at n=16A122049G.f. A(x) satisfies: A(x) = 1 + x - x^2 * A(x/(1 - x)) / (1 - x).at n=11A346078First term of the n-th differences of the composite numbers. Inverse zero-based binomial transform of A002808.at n=18A377036