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A019472
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Weak preference orderings of n alternatives, i.e. orderings that have indifference between at least two alternatives.
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0
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0, 0, 1, 7, 51, 421, 3963, 42253, 505515, 6724381, 98618763, 1582715773, 27612565995, 520631327581, 10554164679243, 228975516609853, 5294731892093355, 130015079601039901, 3379132289551117323, 92679942218919579133, 2675254894236207563115
(list; graph; refs; listen; history; internal format)
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