A003008 - OEIS

This site is supported by donations to The OEIS Foundation.

A003008

Number of n-level expressions.
(Formerly M1147)

1, 1, 2, 4, 8, 17, 39, 90, 213 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	REFERENCES	`Guy, R. K. and Selfridge, J. L.; 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: A036375 A036376 A000598 * A185352 A054199 A054197` `Adjacent sequences: A003005 A003006 A003007 * A003009 A003010 A003011`
	KEYWORD	`nonn,more`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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

Last modified February 14 23:53 EST 2012. Contains 205689 sequences.