

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
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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: A136567 A109708 A035468 * A051777 A262709 A107628
Adjacent sequences: A263857 A263858 A263859 * A263861 A263862 A263863


KEYWORD

nonn,tabf


AUTHOR

Christian Stump, Oct 28 2015


STATUS

approved



