G.f.: (1+x^3)^2/((1-x^2)*(1-x^3)*(1-x^4)). 1, 0, 1, 3, 2, 3, 6, 6, 7, 10, 11, 13, 16, 17, 20, 24, 25, 28, 33, 35, 38, 43, 46, 50, 55, 58
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