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A012017
sec(sin(tan(x)))=1+1/2!*x^2+9/4!*x^4+153/6!*x^6+2993/8!*x^8...
0
1, 1, 9, 153, 2993, -72111, -33331719, -7328604631, -1581635839519, -356792088521439, -81022312424248727, -15576441107086727111, 22243831754082386577, 3229505766853670411015281
OFFSET
0,3
CROSSREFS
Sequence in context: A165232 A246641 A169958 * A130980 A133309 A228713
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved