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A013090
sec(arcsinh(x)+arcsin(x))=1+4/2!*x^2+80/4!*x^4+4120/6!*x^6...
0
1, 4, 80, 4120, 394880, 61069600, 13845756800, 4331363670400, 1786609560320000, 939754328209216000, 613833877949676800000, 487486352498634760960000, 462560462591422971975680000
OFFSET
0,2
CROSSREFS
Sequence in context: A013031 A012923 A012922 * A012042 A013139 A013007
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved