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A013511
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tanh(sec(x)-sech(x))=2/2!*x^2-118/6!*x^6-29998/10!*x^10...
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0
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2, -118, -29998, 611334362, -1141045350238, -231711278648170198, 7649386255065750464882, 1186434281262233535413422202, -294894146013123744005989421634238, -35339306131583165000023092663749603638, 51906656021441065578375756307601650588611602
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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MATHEMATICA
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With[{nn=50}, Take[CoefficientList[Series[Tanh[Sec[x]-Sech[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] (* Harvey P. Dale, Dec 29 2015 *)
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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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STATUS
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approved
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