G.f.: (1-x^2+x^3)/(1-3*x^2+2*x^4). 1, 0, 2, 1, 4, 3, 8, 7, 16, 15, 32, 31, 64, 63, 128, 127, 256, 255, 512, 511, 1024, 1023
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