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A046997 Number of Baxter permutations: A001183/2. 0
0, 1, 1, 9, 33, 187, 847, 4911, 25849 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

CROSSREFS

Sequence in context: A137627 A189179 A146445 * A013488 A186762 A063423

Adjacent sequences:  A046994 A046995 A046996 * A046998 A046999 A047000

KEYWORD

nonn,more

AUTHOR

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

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.