G.f.: (1+2*x^3+2*x^6)/((1-x)*(1-x-x^2+x^3-x^4-x^5+x^6)). 1, 2, 4, 8, 14, 24, 40, 65, 104, 164, 258, 404, 632, 986, 1537, 2394, 3728, 5804, 9034
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