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A016101
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(n! - n)/2 for even n.
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0
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0, 10, 357, 20156, 1814395, 239500794, 43589145593, 10461394943992, 3201186852863991, 1216451004088319990, 562000363888803839989, 310224200866619719679988, 201645730563302817791999987
(list; graph; refs; listen; history; internal format)
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