id:A122647 - OEIS Search Results

Search: id:A122647

Displaying 1-1 of 1 results found.

page 1

Number of permutations of length 2n-1 with no local maxima or minima in even positions.

+0
2

1, 2, 14, 204, 5104, 195040, 10570416, 771171296, 72871890176, 8658173200896, 1263326817241600, 222078432102900736, 46291130226003357696, 11289508838355990634496, 3184719803676823556888576, 1028950134725811309304442880, 377483869192551997938994315264, 156057810922284533544621710639104 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`M. La Croix, A combinatorial proof of a result of Gessel and Greene, Discr. Math., 306 (2006), 2251-2256.`
	FORMULA	`Equals A113583(n)/2^(n-1).`
	CROSSREFS	`Sequence in context: A102224 A123543 A054652 this_sequence A158097 A136550 A068369` `Adjacent sequences: A122644 A122645 A122646 this_sequence A122648 A122649 A122650`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 21 2006`

page 1

Search completed in 0.002 seconds

Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research