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A284713 Number of indecomposable permutations avoiding the pattern 4231. 1
1, 1, 3, 12, 56, 289, 1604, 9415, 57801, 368269, 2421115, 16352401, 113075441, 798316997, 5741446395, 41984708298, 311673028845, 2345644392051, 17876342623580, 137820598360123, 1073961913716521, 8452182814380104, 67136452766364121, 537890721293399309 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
A. L. L. Gao, S. Kitaev, P. B. Zhang. On pattern avoiding indecomposable permutations, arXiv:1605.05490 [math.CO], 2016.
FORMULA
G.f.: 1 - 1/g(x), where g(x) is the (at present unknown) g.f. for A061552. - Vaclav Kotesovec, Apr 03 2017
CROSSREFS
Cf. A061552.
Sequence in context: A303925 A215252 A284712 * A180256 A369600 A027390
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 02 2017
EXTENSIONS
More terms from Vaclav Kotesovec, Apr 03 2017
Name corrected by Michael D. Weiner, Apr 10 2018
STATUS
approved

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Last modified March 19 06:53 EDT 2024. Contains 370953 sequences. (Running on oeis4.)