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Search: id:A006361
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| A006361 |
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Antichains (or order ideals) in the poset 2*2*4*n or size of the distributive lattice J(2*2*4*n)
(Formerly M5370)
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+0
9
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| 1, 105, 3490, 59542, 650644, 5157098, 32046856, 164489084, 723509159, 2801747767, 9748942554, 30967306114, 90930233726, 249319296218, 643622467414, 1575086681342, 3675063064675, 8215220917795
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
J. Berman and P. Koehler, Cardinalities of finite distributive lattices, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), 103-124.
G. Kreweras, Les preordres totaux compatibles avec un ordre partiel. Math. Sci. Humaines No. 53 (1976), 5-30.
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LINKS
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Index entries for sequences related to posets
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MATHEMATICA
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MatrixPower[ ZetaP[ #, n + 1 ][ [ 1, Card[ # ] ] ]&@JofP[ Chain[ 2, 2, 4 ] ]
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CROSSREFS
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Cf. A000372, A056932, A006360, A006362, A056933, A056934, A056935, A056936, A056937.
Sequence in context: A154633 A122814 A112490 this_sequence A075350 A165055 A075914
Adjacent sequences: A006358 A006359 A006360 this_sequence A006362 A006363 A006364
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu), Jul 16 2000
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