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A007411 Number of matrices with n columns whose rows do not cover each other. Also antichain covers of an unlabeled n-set.
(Formerly M3558)
+0
3
1, 4, 19, 179, 16142 (list; graph; listen)
OFFSET

2,2

REFERENCES

V. Jovovic and G. Kilibarda, On the number of Boolean functions in the Post classes F^{mu}_8, Diskretnaya Matematika, 11 (1999), no. 4, 127-138 (translated in Discrete Mathematics and Applications, 9, (1999), no. 6)

V. Jovovic, G. Kilibarda, On enumeration of the class of all monotone Boolean functions, in preparation.

FORMULA

a(n)=A003182(n)-A003182(n-1)-1=A006602(n)-1.

CROSSREFS

Cf. A037843, A006126.

Adjacent sequences: A007408 A007409 A007410 this_sequence A007412 A007413 A007414

Sequence in context: A007788 A067577 A126147 this_sequence A072879 A112958 A080991

KEYWORD

nonn,hard

AUTHOR

Micha Hofri (hofri(AT)cs.rice.edu)

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.


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