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A037843
Number of matrices with n columns whose rows do not cover each other; ordered antichains of subsets of an n-set.
+0
2
2, 3, 7, 39, 2551, 22928343, 6641112790058484007
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Maintained by
N. J. A. Sloane
(
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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