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%I M4372 N1837 #18 Dec 19 2021 09:56:16
%S 0,1,1,7,21,112,456,2603,13203
%N Number of nontrivial Baxter permutations of length 2n-1.
%D W. M. Boyce, Generation of a class of permutations associated with commuting functions, Math. Algorithms, 2 (1967), 19-26.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H W. M. Boyce, <a href="/A001181/a001181_1.pdf">Generation of a class of permutations associated with commuting functions</a>, 1967; annotated and corrected scanned copy.
%H W. M. Boyce, <a href="/A001181/a001181.jpg">Correction to page 25 (Part 1)</a>
%H W. M. Boyce, <a href="/A001181/a001181_1.jpg">Correction to Page 25 (Part 2)</a>
%H W. M. Boyce, <a href="/A001181/a001181.pdf">Baxter Permutations and Functional Composition</a>, Unpublished Memorandum, Jan 26 1978
%Y Cf. A001181, A001183.
%K nonn,nice,more
%O 1,4
%A _N. J. A. Sloane_
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