A003006 - OEIS

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A003006

Number of n-level expressions.
(Formerly M0845)

1, 1, 2, 3, 7, 15, 35, 81, 195 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	REFERENCES	`R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis. Amer. Math. Monthly 80 (1973), 868-876.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	LINKS	`R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis (annotated cached copy)` `Index entries for sequences related to parenthesizing`
	CROSSREFS	`Is this the same as A052321?` `Sequence in context: A198683 A001932 A005909 * A052321 A114584 A039826` `Adjacent sequences: A003003 A003004 A003005 * A003007 A003008 A003009`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 14:02 EST 2012. Contains 205811 sequences.