id:A028304 - OEIS Search Results

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ceil((1/(ceil(n/2)+1))*binomial(n,floor(n/2))) (interpolates between Catalan numbers).

+0
1

1, 1, 1, 1, 2, 3, 5, 7, 14, 21, 42, 66, 132, 215, 429, 715, 1430, 2431, 4862, 8398, 16796, 29393, 58786, 104006, 208012, 371450, 742900, 1337220, 2674440, 4847423, 9694845, 17678835, 35357670, 64822395 (list; graph; listen)

	OFFSET	`0,5`
	REFERENCES	`D. Miklos et al., eds., Combinatorics, Paul Erdos is Eighty, Bolyai Math. Soc., 1993, Vol. 1, p. 101.`
	CROSSREFS	`Sequence in context: A046808 A097799 A005629 this_sequence A157833 A151531 A079987` `Adjacent sequences: A028301 A028302 A028303 this_sequence A028305 A028306 A028307`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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

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