-13397domain: ZAppears in sequencesNumerators of coefficients in a series solution to a certain differential equation.at n=4A104996a(1) = 1; a(2) = 1; a(3) = 1; a(4) = 1; a(5) = 1; a(n) = a(n-1)+4a(n-2)-3a(n-3)-3a(n-4)+a(n-5) for n >= 6.at n=18A122608