G.f.: (-1+x^2+x^3)/(-1+x^2+x^3+x^4). 1, 0, 0, 0, 1, 0, 1, 1, 2, 2, 4, 5, 8, 11, 17, 24, 36, 52, 77, 112, 165, 241, 354, 518, 760
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