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A012158
sech(tan(sinh(x)))=1-1/2!*x^2-7/4!*x^4-73/6!*x^6-239/8!*x^8...
0
1, -1, -7, -73, -239, 95311, 12793417, 1502683335, 172513245857, 17253776069663, 455220048522521, -596864160295290537, -305119961556198266191, -109834061252143977404561
OFFSET
0,3
CROSSREFS
Sequence in context: A188465 A142053 A012049 * A139966 A175205 A373685
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
More terms from N. J. A. Sloane, Aug 27 2006
STATUS
approved