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A215257 Number of indecomposable permutations sortable by a double-ended queue. 4
0, 1, 1, 3, 13, 67, 383, 2345, 15069, 100341, 686515, 4797997, 34110765, 245926667, 1793867881, 13214905229, 98177212059, 734746226575, 5534054981071, 41917876423855, 319102504087883, 2440086947417629, 18733909260242195, 144354928765952131, 1116015033661158079, 8654019249571514621, 67292250859412467583, 524583875375437922949 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Suggested by Peter Doyle in an email message, Sep 04 2012

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 0..100

FORMULA

INVERTi transform of A182216.

CROSSREFS

Cf. A003319, A182216, A216040, A215252.

Sequence in context: A064062 A114191 A107592 * A295226 A028418 A180191

Adjacent sequences:  A215254 A215255 A215256 * A215258 A215259 A215260

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 07 2012. a(0)=0 added by N. J. A. Sloane, Sep 12 2012

EXTENSIONS

Name clarified by Peter Doyle, Dec 13 2013

STATUS

approved

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Last modified May 27 03:03 EDT 2020. Contains 334647 sequences. (Running on oeis4.)