8388596domain: NAppears in sequencesa(n) = 3*a(n-1) - a(n-2) - 3*a(n-3) + 2*a(n-4).at n=23A084174Expansion of o.g.f. x*(1 - x + x^2)/(1 -3*x +x^2 +3*x^3 -2*x^4).at n=23A173009Expansion of g.f. 8/(1-2*z)-12/(1-z)+z+5.at n=20A173034