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A013442
arcsin(tan(x)-arctan(x))=4/3!*x^3-8/5!*x^5+992/7!*x^7-14464/9!*x^9...
0
4, -8, 992, -14464, 3391232, -175044608, 64560399360, -8423762821120, 4197760943882240, -1054662864854450176, 677817013904397697024, -277456857021505605206016, 226696976060712490528407552
OFFSET
0,1
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[ArcSin[Tan[x]-ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {4, -1, 2}]] (* Harvey P. Dale, Dec 23 2019 *)
CROSSREFS
Sequence in context: A308553 A177860 A013443 * A013441 A013445 A201386
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved