G.f. -x*(x^2+1)*(x+1)^2/((2*x^3+x^2-1)*(x^4+1)). 0, 1, 2, 3, 6, 7, 10, 17, 22, 37, 58, 83, 134, 199, 298, 465, 694, 1061, 1626, 2451
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