A013454 - OEIS

A013454

cos(tan(x)-tanh(x))=1-160/6!*x^6-261120/10!*x^10+3942400/12!*x^12...

1, 0, 0, -160, 0, -261120, 3942400, -1538068480, 111522611200, -25458261360640, 5279051703910400, -1021353507684352000, 440307608869404672000, -89935097031558126632960

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OFFSET

0,4

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Cos[Tan[x]-Tanh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 31 2019 *)

CROSSREFS

Sequence in context: A263518 A213695 A224430 * A013455 A013465 A013466

Adjacent sequences: A013451 A013452 A013453 * A013455 A013456 A013457

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved