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

A215257

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =3a(4) =13a(5) =67a(6) =383a(7) =2345a(8) =15069a(9) =100341a(10) =686515a(11) =4797997a(12) =34110765a(13) =245926667a(14) =1793867881a(15) =13214905229a(16) =98177212059a(17) =734746226575

External references