A088536 - OEIS

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A088536

Number of unimodal functions [1..n]->[1..n].

1, 4, 22, 130, 791, 4900, 30738, 194634, 1241383, 7963384, 51325352, 332095816, 2155894508, 14035149748, 91593941402, 599021799242, 3924954250975, 25760310654100, 169322682857430, 1114452091832130, 7344021912458295 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n) = sum_{k=0}^{n-1} binomial(2k+n-1, 2k).`
	CROSSREFS	`Cf. A071920.` `Sequence in context: A199033 A086682 A155862 * A066380 A180899 A007195` `Adjacent sequences: A088533 A088534 A088535 * A088537 A088538 A088539`
	KEYWORD	`nonn`
	AUTHOR	`Yuval Dekel (dekelyuval(AT)hotmail.com), Nov 16 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Aug 09 2005`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.