OFFSET
1,3
COMMENTS
Note that an additional top element is added to make the poset a lattice and thus allow the computation of the Möbius function.
LINKS
Jason P. Smith, A formula for the Möbius function of the permutation poset based on a topological decomposition, arXiv preprint arXiv:1506.04406 [math.CO], 2015.
Jason P. Smith, Java program, 2016.
Einar Steingrimsson, Some open problems on permutation patterns, arXiv:1210.7320 [math.CO], 2012-2013.
Einar Steingrimsson, Some open problems on permutation patterns, In Surveys in Combinatorics, 409, pages 239-263. London Mathematical Society Lecture Note Series, 2013.
CROSSREFS
KEYWORD
sign,hard,more
AUTHOR
Jason P Smith, Sep 30 2015
EXTENSIONS
a(10) from Jason P Smith, Jul 28 2016
STATUS
approved