A003007 - OEIS

This site is supported by donations to The OEIS Foundation.

A003007

Number of n-level ladder expressions with A002193.
(Formerly M1145)

1, 1, 2, 4, 8, 17, 38, 89, 208 (list; graph; refs; listen; history; text; 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	`Table of n, a(n) for n=1..9.` `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.`
	STATUS	`approved`

Content is available under The OEIS End-User License Agreement .

Last modified May 21 04:39 EDT 2013. Contains 225474 sequences.