A062716 - OEIS

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A062716

Number of arrangements of 1,2,..,n*n in an n X n matrix such that each row is increasing or decreasing.

1, 2, 24, 13440, 1009008000, 19947543780003840, 170891375144777551827763200, 942542805268120269309770939139883008000, 4650425326497486529782791149613966242353671284224000000 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(1) = 1 and for n >= 2: a(n) = 2^n * A034841(n) = 2^n * (n^2)! / (n!)^n.`
	CROSSREFS	`Cf. A034841.` `Sequence in context: A088600 A066120 A152687 * A137888 A108349 A000722` `Adjacent sequences: A062713 A062714 A062715 * A062717 A062718 A062719`
	KEYWORD	`nonn`
	AUTHOR	`Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 14 2001`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 18 2001`

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Last modified February 17 18:11 EST 2012. Contains 206061 sequences.