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A013476
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Coefficient of x^(4*n+2) in e.g.f. arcsinh(cos(x) - cosh(x)).
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1
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-2, 118, -267122, 3801437638, -188997287445602, 24300893634392843158, -6725983870126469414416082, 3540538990952328979449335176678, -3241779510843677923729210281115258562
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OFFSET
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0,1
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LINKS
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EXAMPLE
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-(2/2!)*x^2 + (118/6!)*x^6 - (267122/10!)*x^10 + (3801437638/14!)*x^14 - ...
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MAPLE
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S:= series(arcsinh(cos(x)-cosh(x)), x, 103):
seq(coeff(S, x, 4*n+2)*(4*n+2)!, n=0..25); # Robert Israel, Aug 16 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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Missing a(0)=-2 inserted, more terms, and title improved by Sean A. Irvine, Aug 07 2018
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STATUS
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approved
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