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A006219 From descending subsequences of permutations.
(Formerly M2752)
1
3, 8, 25, 89, 357, 1602, 7959, 43127, 250591, 1537051, 9827077 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

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

LINKS

Table of n, a(n) for n=3..13.

S. Pilpel, Descending subsequences of random permutations, J. Combin. Theory, A 53 (1990), 96-116.

CROSSREFS

Column 3 of A224652.

Sequence in context: A185043 A033483 A130522 * A009268 A024430 A182927

Adjacent sequences:  A006216 A006217 A006218 * A006220 A006221 A006222

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(11)-a(13) from Sean A. Irvine, Feb 03 2017

STATUS

approved

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Last modified January 18 04:47 EST 2019. Contains 319269 sequences. (Running on oeis4.)