G.f.: (1+t^2+4*t^3+2*t^4+t^5+3*t^6)/((1-t)^2*(1-t^2)*(1-t^3)^2). 1, 2, 5, 14, 27, 49, 89, 142, 218, 329, 469, 651, 892, 1183, 1542, 1989, 2514, 3138
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