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A217816 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition). 0

%I

%S 1,2,16,272,6531,194062,6720714,261538316,11157463902

%N Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

%H J. B. Lewis, <a href="https://dspace.mit.edu/handle/1721.1/73444">Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux</a>, Ph. D. Dissertation, Department of Mathematics, MIT, 2012.

%Y Cf. A181197, A217799-A217830.

%K nonn,more,changed

%O 0,2

%A _N. J. A. Sloane_, Oct 13 2012

%E a(6)-a(8) from _Lars Blomberg_, Feb 22 2018

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Last modified October 21 14:13 EDT 2018. Contains 316423 sequences. (Running on oeis4.)