G.f.: (1-x+2*x^2+2*x^3+2*x^4-x^5+x^6)/((1-x)*(1-x^2)^2*(1-x^3)). 1, 0, 4, 5, 13, 17, 33, 41, 66, 82, 117, 142, 191, 226, 290, 339, 419, 483, 583, 663
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