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A058956
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Let S(t) = 1 + s_1 t + s_2 t^2 + ... satisfy S' = -S/(2 + S); sequence gives denominators of s_n.
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1
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1, 3, 27, 1, 4374, 98415, 885735, 3720087, 55801305, 1291401630, 813583026900, 4027235983155, 724902476967900, 7710326345931300, 5343256157730390900, 52845390570959910, 5770716650348822172000, 441459823751684896158000
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