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A065888
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a(n) = number of endofunctions on [n] with a 4-cycle a->b->c->d->a and for any x in [n], some iterate f^k(x) = a.
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3
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6, 120, 2160, 41160, 860160, 19840464, 504000000, 14030763120, 425681879040, 13997939172360, 496360987938816, 18891066796875000, 768426686420090880, 33279382190563948320, 1529238539734890577920, 74326797938267012471904
(list; graph; refs; listen; history; internal format)
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