G.f.: Product_{k>0} (1+x^(2*k)+x^(4*k))/ (1-x^(3*k)+x^(6*k)). 1, 0, 1, 1, 2, 1, 3, 2, 5, 3, 7, 5, 10, 7, 14, 11, 20, 15, 27, 22, 37, 30, 49, 42, 66, 56, 86
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