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A143561
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G.f. satisfies: A(x) = ( 1 + x*A(x)/A(-x) )^2.
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0
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1, 2, 9, 24, 88, 280, 1064, 3672, 14456, 52184, 210504, 782232, 3210904, 12176792, 50638440, 194956248, 818961080, 3189915224, 13508052104, 53105011480, 226355549400, 896636646936, 3842662060200, 15317408281944, 65946510374136
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