A012506 cosh(cos(x)*arctan(x))=1+1/2!*x^2-19/4!*x^4+445/6!*x^6-14663/8!*x^8...

1, 1, -19, 445, -14663, 718265, -50970203, 4876389557, -548752599567, 47436062951281, 12631837146241245, -15669443125044502867, 12502889747981009020841, -9927639811374322485212375

Offset

0,3

Links

Harvey P. Dale, Table of n, a(n) for n = 0..100

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Cosh[Cos[x]ArcTan[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Oct 15 2012 *)

Crossrefs

Sequence in context: A108145 A114350 A194730 * A285398 A201798 A284197

Adjacent sequences: A012503 A012504 A012505 * A012507 A012508 A012509

Keyword

sign

Author

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

Status

approved