G.f. (1-3*x+x^2)/((x-1)*(x+1)*(2*x^2-2*x+1)). 1, 1, 2, 5, 4, 1, 8, 15, 16, 1, 32, 65, 64, 1, 128, 255, 256, 1, 512, 1025, 1024
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