-13920domain: ZAppears in sequencesExpansion of 1/(1-x+2*x^2-x^3) in powers of x.at n=34A077954Expansion of 1/(1+x+2*x^2+x^3).at n=34A077979Expansion of 1/(1 + 2*x + 3*x^2 + x^3).at n=22A127896a(n) = Sum_{k=0..n} (-1)^k * binomial(n, k) * A000931(n-k+4).at n=18A144413Expansion of Product_{k>=0} (1-x^(3*k+1))^(3*k+1).at n=35A285050