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A024268
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Expansion of tanh(tan(x)*sinh(x))/2.
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0
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0, 1, 6, -49, -8484, -511379, 6769026, 9445602011, 1884673497336, 61550034487321, -126825694957538754, -61388922632885893849, -9399026972435828464044, 9252373566488286511114501, 9573652356256569791096427066
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..14.
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]*Sinh[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Dec 01 2020 *)
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CROSSREFS
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Cf. A009816.
Sequence in context: A245797 A046195 A305376 * A187528 A187699 A212232
Adjacent sequences: A024265 A024266 A024267 * A024269 A024270 A024271
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs Mar 1997
Previous Mathematica program replaced by Harvey P. Dale, Dec 01 2020
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STATUS
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approved
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