A215257 Number of indecomposable permutations sortable by a double-ended queue.

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

Offset: 0

Author

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

Keywords

• nonn

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

Crossrefs

Cf. A003319, A182216, A216040, A215252.

Formula

INVERTi transform of A182216.

Extensions

Name clarified by Peter Doyle, Dec 13 2013