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A009158 Expansion of cosh(tan(tan(x))). 0
1, 1, 17, 673, 48033, 5387009, 871869745, 192177458593, 55316788832065, 20139680768683777, 9044546204411462737, 4909707244721993221025, 3168104630099094560839393, 2396238201505538217521920001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A063941 A089018 A118769 * A012050 A012157 A012137

Adjacent sequences:  A009155 A009156 A009157 * A009159 A009160 A009161

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 November 13 00:25 EST 2019. Contains 329083 sequences. (Running on oeis4.)