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A281723 Smallest positive integer that cannot be obtained as the number of linear extensions of a poset of size n. 1
2, 2, 3, 4, 7, 13, 17, 59, 253, 979 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) is the smallest positive integer such that A160371(a(n)) > n.

LINKS

Table of n, a(n) for n=0..9.

EXAMPLE

a(8) = 253, so the number 253 cannot be obtained as the number of linear extensions of a poset of size 8, but every integer from 1 to 252 can.

CROSSREFS

Cf. A160371

Sequence in context: A051920 A286350 A023105 * A011784 A302487 A032252

Adjacent sequences:  A281720 A281721 A281722 * A281724 A281725 A281726

KEYWORD

nonn,hard,more

AUTHOR

Fran├žois Labelle, Jan 28 2017

STATUS

approved

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Last modified October 19 11:21 EDT 2021. Contains 348088 sequences. (Running on oeis4.)