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A012828
arcsinh(sec(x)*arcsinh(x))=x+1/3!*x^3+13/5!*x^5-163/7!*x^7+12409/9!*x^9...
0
1, 1, 13, -163, 12409, -931207, 131515525, -22736601067, 5414338951025, -1621869733040399, 608306871018022013, -276781704508170478131, 150811097250449098751721, -96804685135198494755720343
OFFSET
0,3
CROSSREFS
Sequence in context: A133180 A090134 A087400 * A119539 A277412 A368657
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved