A132220 - OEIS

This site is supported by donations to The OEIS Foundation.

A132220

Number of line graphs on n unlabeled nodes.

1, 2, 4, 10, 24, 63, 166, 471, 1408, 4436, 14719, 51468, 188754, 725010, 2907576, 12141462, 52654529, 236584104, 1098926868, 5266708497, 25997964452, 131975740172, 688019138485, 3678898458587 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Eric Weisstein's World of Mathematics. Line Graph.`
	FORMULA	`Euler transform of A003089.`
	CROSSREFS	`Cf. A132219(labeled case).` `Sequence in context: A138175 A121691 A124499 * A007874 A121704 A049144` `Adjacent sequences: A132217 A132218 A132219 * A132221 A132222 A132223`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 14 2007`

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

Last modified February 16 21:51 EST 2012. Contains 205978 sequences.