A003007 - OEIS

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A003007

Number of n-level expressions.
(Formerly M1145)

1, 1, 2, 4, 8, 17, 38, 89, 208 (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	`Sequence in context: A119685 A025276 A006461 * A086615 A081124 A090901` `Adjacent sequences: A003004 A003005 A003006 * A003008 A003009 A003010`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 10:24 EST 2012. Contains 205614 sequences.