A009391 - OEIS

This site is supported by donations to The OEIS Foundation.

A009391

Expansion of ln(1+tanh(x))/cos(x).

0, 1, -1, 3, -4, 25, -61, 427, -1184, 12465, -49201, 555731, -2361844, 35135945, -191422141, 2990414715, -17147588384, 329655706465, -2289437638081, 45692713833379, -329955144475204, 7777794952988025, -65643617893832221 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Log[ 1+Tanh[ x ] ]/Cos[ x ]`
	CROSSREFS	`a(2n+1) = A009843(n), \|a(2n)\| = A009391(2n).` `Sequence in context: A065809 A093600 A128778 * A192346 A055348 A004206` `Adjacent sequences: A009388 A009389 A009390 * A009392 A009393 A009394`
	KEYWORD	`sign,easy`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

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

Last modified February 15 03:59 EST 2012. Contains 205694 sequences.