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A006220 From descending subsequences of permutations.
(Formerly M2866)
1
1, 1, 3, 10, 45, 251, 1638, 12300, 104877, 1000135, 10534062, 121436206, 1521332904 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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=1..13.

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

CROSSREFS

Diagonal of A224652.

Sequence in context: A184947 A207652 A099237 * A020026 A077002 A268224

Adjacent sequences:  A006217 A006218 A006219 * A006221 A006222 A006223

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 23:05 EST 2019. Contains 319282 sequences. (Running on oeis4.)