G.f.: x*(1+3*x+x^2)/((1-x^2)^2*(1-x^5)). 0, 1, 3, 3, 6, 5, 10, 10, 15, 15, 20, 21, 28, 28, 36, 35, 45, 45, 55, 55, 65, 66, 78, 78, 91
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