G.f.: (3+x+x^2+2*x^3)/(1-x^2-x^4). 3, 1, 4, 3, 7, 4, 11, 7, 18, 11, 29, 18, 47, 29, 76, 47, 123, 76, 199, 123, 322, 199, 521
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