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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 (list; graph; refs; listen; history; internal format)
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).

CROSSREFS

Cf. A001181, A001183.

Sequence in context: A100025 A121157 A038184 * A001693 A061961 A028248

Adjacent sequences:  A001182 A001183 A001184 * A001186 A001187 A001188

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 03:44 EST 2012. Contains 205860 sequences.