A111576 Number of minimal non-2-stack-sortable permutations of length n.

0, 0, 0, 0, 0, 0, 22, 51, 146

Offset

1,7

References

V. Vatter, The Enumeration and Structure of Permutation Classes, Ph. D. Dissertation, Rutgers Univ., Math. Dept., 2006.

Links

Table of n, a(n) for n=1..9.

M. D. Atkinson, M. M. Murphy and N. Ruskuc, Sorting with two ordered stacks in series, Theoret. Comput. Sci. 289 (2002), 205-223.

R. E. Tarjan, Sorting using networks of queues and stacks, JACM, 19 (1972), 341-346.

Crossrefs

Sequence in context: A191279 A200880 A330409 * A277979 A177726 A101571

Adjacent sequences: A111573 A111574 A111575 * A111577 A111578 A111579

Keyword

nonn,more

Author

N. J. A. Sloane, Nov 17 2005

Status

approved