605201domain: NAppears in sequencesNumber of sequences with terms 1, 2 or 3 summing to n with no three consecutive 1's.at n=25A123908G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 + 4*x)) / (1 + 4*x).at n=10A351185