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A001185
Number of nontrivial Baxter permutations of length 2n-1.
(Formerly M4372 N1837)
2
0, 1, 1, 7, 21, 112, 456, 2603, 13203
OFFSET
1,4
REFERENCES
W. M. Boyce, Generation of a class of permutations associated with commuting functions, Math. Algorithms, 2 (1967), 19-26.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
W. M. Boyce, Generation of a class of permutations associated with commuting functions, 1967; annotated and corrected scanned copy.
W. M. Boyce, Baxter Permutations and Functional Composition, Houston Journal of Mathematics, Volume 7, No. 2, 1981
CROSSREFS
Sequence in context: A261854 A219152 A038184 * A001693 A321521 A061961
KEYWORD
nonn,nice,more
STATUS
approved