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A307346 Number of uniquely sorted permutations of [2n+1] that avoid the patterns 231 and 4123. 0
1, 1, 3, 10, 36, 138, 553, 2288, 9699, 41908 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

C. Defant, Catalan intervals and uniquely sorted permutations, arXiv:1904.02627 [math.CO], 2019.

EXAMPLE

The 3 uniquely sorted permutations of [7] that avoid 231 and 4123 are 2164357, 2143657, and 4321567.

CROSSREFS

Cf. A180874.

Sequence in context: A171753 A002212 A149041 * A202834 A129247 A162162

Adjacent sequences:  A307342 A307343 A307345 * A307347 A307348 A307349

KEYWORD

nonn,more

AUTHOR

Colin Defant, Apr 03 2019

STATUS

approved

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Last modified June 26 00:10 EDT 2019. Contains 324367 sequences. (Running on oeis4.)