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A024273
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Expansion of sin(tanh(x))*x/2.
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0
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0, 1, -6, 111, -3836, 208205, -16162146, 1691108251, -228856755640, 38843134101081, -8072581315789950, 2015026740164435591, -594586585293174554676, 204653655148187534506789
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sin[Tanh[x]]*x/2, {x, 0, nn}], x] Range[ 0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 25 2020 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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Extended with signs Mar 1997
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STATUS
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approved
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