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A056937
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Number of antichains (or order ideals) in the poset 3*3*3*n or size of the distributive lattice J(3*3*3*n)
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8
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1, 980, 211250, 17792748, 781429368, 21238316210, 398925639186, 5585711269074, 61555624183223, 555895303974238, 4242859829536322, 28038281717424550, 163544036697306396, 855242362045150398
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OFFSET
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0,2
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REFERENCES
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Berman and Koehler, Cardinalities of finite distributive lattices, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), p. 103-124
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LINKS
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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