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A087137
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a(n) is the number of permutations in the symmetric group S_n that contain an odd cycle.
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2
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1, 1, 6, 15, 120, 495, 5040, 29295, 362880, 2735775, 39916800, 370945575, 6227020800, 68916822975, 1307674368000, 16813959537375, 355687428096000, 5214921734397375, 121645100408832000, 2004231846526284375
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