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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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Table of n, a(n) for n=0..13.
Index entries for sequences related to posets
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MATHEMATICA
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MatrixPower[ ZetaP[ #, n + 1 ][ [ 1, Card[ # ] ] ]&@JofP[ Chain[ 3, 3, 3 ] ]
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CROSSREFS
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Cf. A000372, A006360, A006361, A006362, A056932, A056933, A056934, A056935, A056936.
Sequence in context: A188337 A109120 A128483 * A122472 A087907 A182574
Adjacent sequences: A056934 A056935 A056936 * A056938 A056939 A056940
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KEYWORD
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nonn,easy
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AUTHOR
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Mitch Harris
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STATUS
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approved
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