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A012032
sec(sin(sinh(x)))=1+1/2!*x^2+5/4!*x^4+13/6!*x^6-1303/8!*x^8...
0
1, 1, 5, 13, -1303, -97351, -5539667, -182565627, 23677748561, 8153921374705, 1571128609968341, 190412412110488701, -16146953133290647751, -22882305147029329939799
OFFSET
0,3
CROSSREFS
Sequence in context: A009157 A153374 A247789 * A121228 A201260 A012173
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved