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A012386
sech(tan(x)*arcsin(x))=1-12/4!*x^4-360/6!*x^6-7280/8!*x^8...
0
1, 0, -12, -360, -7280, 504000, 121581504, 14369939584, 56810973440, -657138821830656, -255226784793623552, -45397358372525164544, 15722139759017802895360, 20152649683846086682296320
OFFSET
0,3
CROSSREFS
Sequence in context: A012553 A128043 A012431 * A130213 A012633 A009079
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved