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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) 7
 1, 4, 19, 179, 16142, 489996794 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 REFERENCES V. Jovovic and G. Kilibarda, On enumeration of the class of all monotone Boolean functions, in preparation. N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS M. Hofri, Email to N. J. A. Sloane, May 1994. V. Jovovic and G. Kilibarda, On the number of Boolean functions in the Post classes F^{mu}_8, in Russian, Diskretnaya Matematika, 11 (1999), no. 4, 127-138. V. Jovovic and G. Kilibarda, On the number of Boolean functions in the Post classes F^{mu}_8, English translation, in Discrete Mathematics and Applications, 9, (1999), no. 6, 593-605. FORMULA a(n) = A003182(n) - A003182(n-1) - 1 = A006602(n) - 1. CROSSREFS Cf. A037843, A006126, A003182, A006602. Sequence in context: A155804 A292167 A126147 * A276259 A072879 A112958 Adjacent sequences:  A007408 A007409 A007410 * A007412 A007413 A007414 KEYWORD nonn,hard,more AUTHOR Micha Hofri (hofri(AT)cs.rice.edu) EXTENSIONS a(7) from A003182. - N. J. A. Sloane, Aug 13 2015 STATUS approved

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Last modified January 23 05:03 EST 2021. Contains 340384 sequences. (Running on oeis4.)