The number of permutations of length n that can be sorted by 3 pop stacks in parallel.
A164871
The number of permutations of length n that can be sorted by 3 pop stacks in parallel.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =118a(6) =644a(7) =3622a(8) =20366a(9) =113686a(10) =630464a(11) =3481084a(12) =19171838a(13) =105444400a(14) =579547826a(15) =3184321642a(16) =17493771830a(17) =96100287256a(18) =527905628552
External references
- oeis: A164871