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A095239
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Analog of A095236 when the phones are arranged in a circle.
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4
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1, 2, 6, 8, 40, 96, 168, 384, 1728, 15360, 50688, 221184, 299520, 1290240, 3628800, 30965760, 65802240, 743178240, 7060193280, 237817036800, 624269721600, 5231974809600, 28716407193600, 479439146188800
(list; graph; refs; listen; history; internal format)
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