G.f. A(x) satisfies: A(x)^2 = 1/AGM(1, 1 - 8*x/A(x)^2 ). 1, 2, 0, 0, 2, 4, 0, 0, 16, 40, 0, 0, 200, 544, 0, 0, 3006, 8540, 0, 0, 49956
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