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A056937
Number of antichains (or order ideals) in the poset 3*3*3*n or size of the distributive lattice J(3*3*3*n)
+0
9
1, 980, 211250, 17792748, 781429368, 21238316210, 398925639186, 5585711269074, 61555624183223, 555895303974238, 4242859829536322, 28038281717424550, 163544036697306396, 855242362045150398
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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