G.f.: (z^12+1-z^11-z^10+z^8-z^6+z^5-z^3+z)/((z+1)*(z-1)^2). 1, 2, 3, 3, 4, 5, 5, 6, 7, 8, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16
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