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A013472
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Coefficient of [x^(4*n+2)] in e.g.f. tan(cosh(x) - cos(x)).
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0
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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 + (242/6!)*x^6 + (493922/10!)*x^10 + (4867022162/14!)*x^14 + ...
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MAPLE
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g := taylor(tan(cos(x)-cosh(x)), x=0, 100):q := seq(abs(coeff(g, x, 4*i+2)*(4*i+2)!), i=0..12);
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CROSSREFS
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KEYWORD
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nonn
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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 and title improved by Sean A. Irvine, Aug 06 2018
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STATUS
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approved
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