A121124 - OEIS

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A121124

Unbranched a-4-catapolynonagons (see Brunvoll reference for precise definition).

1, 4, 21, 138, 864, 5526, 34992, 221724, 1399680 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	REFERENCES	`J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.`
	CROSSREFS	`Sequence in context: A001909 A205077 A052852 * A180399 A087761 A120368` `Adjacent sequences: A121121 A121122 A121123 * A121125 A121126 A121127`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Aug 13, 2006`

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Last modified February 13 16:45 EST 2012. Contains 205523 sequences.