A129876 - OEIS

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A129876

Sequence i_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).

2, 4, 14, 52, 210, 888, 3886, 17448 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	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: A046650 A055727 A003500 * A038055 A006385 A183949` `Adjacent sequences: A129873 A129874 A129875 * A129877 A129878 A129879`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 26 2007`

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Last modified February 16 01:31 EST 2012. Contains 205860 sequences.