%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, A217799A217830.
%K nonn,more
%O 0,2
%A _N. J. A. Sloane_, Oct 13 2012
%E a(6)a(8) from _Lars Blomberg_, Feb 22 2018
