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A009160 Expansion of cosh(tan(x))/cos(x). 0
1, 2, 20, 448, 17296, 1013600, 83547584, 9196867072, 1301697829120, 230093807905280, 49636887216382976, 12825384465418534912, 3908078275606800338944, 1386160615200497825275904 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

Cosh[ Tan[ x ] ]/Cos[ x ] (* Even Part *)

CROSSREFS

Sequence in context: A009746 A009749 A012533 * A188811 A009252 A210901

Adjacent sequences:  A009157 A009158 A009159 * A009161 A009162 A009163

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested Mar 15 1997 by Olivier Gérard.

STATUS

approved

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Last modified December 12 17:33 EST 2019. Contains 329960 sequences. (Running on oeis4.)