G.f.: (x^3 + x^2 + x + 1)/(1 - x - x^2 - x^3 - x^4 - x^5). 0, 0, 1, 0, 1, 2, 4, 8, 15, 30, 59, 116, 228, 448, 881, 1732, 3405, 6694, 13160, 25872
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