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A263860 Triangle read by rows: T(n,k) (n>=0, k>=1) is the number of posets with n elements and k linear extensions. 1
1, 1, 1, 1, 1, 2, 1, 0, 0, 1, 1, 3, 2, 2, 1, 3, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 4, 3, 5, 3, 7, 2, 5, 2, 4, 1, 4, 0, 2, 2, 2, 0, 2, 0, 4, 0, 0, 0, 2, 1, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

COMMENTS

Row sums give A000112.

LINKS

Table of n, a(n) for n=0..101.

FindStat - Combinatorial Statistic Finder, The number of linear extensions of a poset.

EXAMPLE

Triangle begins:

1,

1,

1,1,

1,2,1,0,0,1,

1,3,2,2,1,3,0,2,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,

...

CROSSREFS

Cf. A000112.

Sequence in context: A324904 A109708 A035468 * A051777 A262709 A107628

Adjacent sequences:  A263857 A263858 A263859 * A263861 A263862 A263863

KEYWORD

nonn,tabf

AUTHOR

Christian Stump, Oct 28 2015

STATUS

approved

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Last modified October 5 20:00 EDT 2022. Contains 357261 sequences. (Running on oeis4.)