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A012508
sech(cos(x)*arctan(x))=1-1/2!*x^2+25/4!*x^4-1105/6!*x^6+91313/8!*x^8...
0
1, -1, 25, -1105, 91313, -12232385, 2400320393, -649247356433, 231544408317537, -105271075840787713, 59429582363323624185, -40787189186519841731153, 33444147237661076070865681
OFFSET
0,3
CROSSREFS
Sequence in context: A246923 A066852 A123204 * A112102 A012799 A120694
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved