A008775 - OEIS

This site is supported by donations to The OEIS Foundation.

A008775

Expansion of 2(1 + cos x cosh x )^-1.

1, 2, 272, 261392, 923578112, 8687146706432, 179207715900772352, 7123449535546491471872, 497301503279765920504020992, 56869795869126246818618490355712 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	REFERENCES	`Goulden and Jackson, Combin. Enum., Wiley, 1983 p. 287.`
	CROSSREFS	`Cf. A101921.` `Sequence in context: A007512 A048534 A135696 * A174710 A200168 A119553` `Adjacent sequences: A008772 A008773 A008774 * A008776 A008777 A008778`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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

Last modified February 15 21:56 EST 2012. Contains 205860 sequences.