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A118537
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Number of functions f: {1, 2, ..., n} --> {1, 2, ..., n} such that f(1) != f(2), f(2) != f(3), ..., f(n-1) != f(n), f(n) != f(1).
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2
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2, 6, 84, 1020, 15630, 279930, 5764808, 134217720, 3486784410, 99999999990, 3138428376732, 106993205379060, 3937376385699302, 155568095557812210, 6568408355712890640, 295147905179352825840, 14063084452067724991026
(list; graph; refs; listen; history; internal format)
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