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A012445
sin(arctan(x)*tan(x))=2/2!*x^2+40/6!*x^6-2688/8!*x^8-31712/10!*x^10...
0
2, 0, 40, -2688, -31712, -13038080, -341144960, -124075126784, -16972742475264, 4013224846508032, -4370688326014457856, 2734360152236817809408, -2075517087570212545880064, 1712256529842324555250663424, -1579921804125758497599230672896
OFFSET
0,1
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTan[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Dec 20 2014 *)
CROSSREFS
Sequence in context: A357541 A230888 A185281 * A012450 A303491 A303396
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
More terms from Harvey P. Dale, Dec 20 2014
STATUS
approved