id:A009391 - OEIS Search Results

Search: id:A009391

Displaying 1-1 of 1 results found.

page 1

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

+0
2

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; listen)

	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 this_sequence A055348 A004206 A151372` `Adjacent sequences: A009388 A009389 A009390 this_sequence A009392 A009393 A009394`
	KEYWORD	`sign,easy`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

page 1

Search completed in 0.002 seconds

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research