G.f.: (1+t^3)^2/((1-t)*(1-t^2)^2*(1-t^4)). 1, 1, 3, 5, 9, 13, 20, 28, 39, 51, 67, 85, 107, 131, 160, 192, 229, 269, 315, 365, 421
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