id:A003006 - OEIS Search Results

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Number of n-level expressions.
(Formerly M0845)

+0
1

1, 1, 2, 3, 7, 15, 35, 81, 195 (list; graph; listen)

	OFFSET	`1,3`
	REFERENCES	`N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).` `R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis. Amer. Math. Monthly 80 (1973), 868-876.`
	LINKS	`Index entries for sequences related to parenthesizing`
	CROSSREFS	`Is this the same as A052321?` `Sequence in context: A078007 A001932 A005909 this_sequence A052321 A114584 A039826` `Adjacent sequences: A003003 A003004 A003005 this_sequence A003007 A003008 A003009`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.