A129879 - OEIS

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A129879

Sequence a_{a_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where a_n is A129878.

1, 0, 3, 9, 42, 182, 821, 3754 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	REFERENCES	`Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper Arrays, Discrete Math., 307 (2007), 1844-1864.`
	FORMULA	`See Quaintance reference for generating functions that produce A129872-A129886.`
	CROSSREFS	`Sequence in context: A113271 A183306 A057724 * A001427 A020128 A018965` `Adjacent sequences: A129876 A129877 A129878 * A129880 A129881 A129882`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 26 2007`

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Last modified February 15 11:25 EST 2012. Contains 205777 sequences.