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A006219 From descending subsequences of permutations.
(Formerly M2752)
1

%I M2752

%S 3,8,25,89,357,1602,7959,43127,250591,1537051,9827077

%N From descending subsequences of permutations.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H S. Pilpel, <a href="http://dx.doi.org/10.1016/0097-3165(90)90022-O">Descending subsequences of random permutations</a>, J. Combin. Theory, A 53 (1990), 96-116.

%Y Column 3 of A224652.

%K nonn,more

%O 3,1

%A _N. J. A. Sloane_.

%E a(11)-a(13) from _Sean A. Irvine_, Feb 03 2017

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Last modified September 26 16:12 EDT 2021. Contains 347669 sequences. (Running on oeis4.)