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A263929 Number of permutations that are sortable with two stacks in series. 1
1, 1, 2, 6, 24, 120, 720, 5018, 39374, 337816, 3092691, 29659731, 294107811, 2988678546, 30935695794, 324832481490, 3450158410649, 36993206191004, 399827092167771, 4351269802153188 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..19.

Andrew Elvey-Price, Anthony J Guttmann, Permutations sortable by two stacks in series, arXiv:1510.08663 [math.CO], (29-October-2015)

CROSSREFS

Sequence in context: A177541 A177551 A177535 * A324139 A324138 A324137

Adjacent sequences:  A263926 A263927 A263928 * A263930 A263931 A263932

KEYWORD

nonn

AUTHOR

Joerg Arndt, Oct 30 2015

STATUS

approved

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Last modified April 8 07:40 EDT 2020. Contains 333312 sequences. (Running on oeis4.)