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A012829 tanh(sec(x)*arcsinh(x))=x-504/7!*x^7+11904/9!*x^9-1023616/11!*x^11... 0
1, 0, 0, -504, 11904, -1023616, 190103680, -27296677888, 6616599617536, -2038987281108992, 733961541487493120, -333541890591777587200, 180073909555827471974400, -114101788265471646305353728 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A141145 A253724 A166763 * A013973 A218132 A012744

Adjacent sequences:  A012826 A012827 A012828 * A012830 A012831 A012832

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified June 27 13:59 EDT 2022. Contains 354896 sequences. (Running on oeis4.)