id:A087923 - OEIS Search Results

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Number of ways of arranging the numbers 1 ... 2n into a 2 X n array so there is exactly one local maximum.

+0
2

2, 16, 208, 3584, 76544, 1947648, 57477120, 1929117696, 72545402880, 3020819005440, 137959904378880, 6855868809216000, 368270708268072960, 21262037565623500800, 1312956239068318924800 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`A row of the array in A087783. Cf. A007846.` `Sequence in context: A036081 A161568 A138429 this_sequence A004121 A114531 A012056` `Adjacent sequences: A087920 A087921 A087922 this_sequence A087924 A087925 A087926`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 27 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research