A009026 - OEIS

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A009026

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

1, 0, -2, 3, 1, 10, -176, 735, -1707, 18828, -251646, 1819895, -10653939, 114938382, -1464499076, 11843786955, -40962861815, -513203638440, 26152049892934, -897502828846005, 24985080257574265, -628449474239226990 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..21.`
	MATHEMATICA	`Cos[ Log[ 1+x ] ]/Cosh[ x ]`
	CROSSREFS	`Sequence in context: A106342 A107855 A211019 * A046222 A074307 A163486` `Adjacent sequences: A009023 A009024 A009025 * A009027 A009028 A009029`
	KEYWORD	`sign,easy`
	AUTHOR	`R. H. Hardin`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`
	STATUS	`approved`

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Last modified May 25 09:36 EDT 2013. Contains 225646 sequences.