A129877 - OEIS

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A129877

Sequence i_{a_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n is A129876, a_n is A129878.

2, 0, 6, 12, 58, 220, 958, 4184 (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: A087464 A078048 A110667 * A171734 A079203 A151751` `Adjacent sequences: A129874 A129875 A129876 * A129878 A129879 A129880`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 26 2007`

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