A012684 tanh(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+80/6!*x^6+14464/8!*x^8...

2, -16, 80, 14464, -1924352, 182456320, -4821633024, -5022496751616, 2274499602284544, -641508042469015552, 58440162971714846720, 91048038738283980652544, -93320295604487977397387264

Offset

0,1

Links

Table of n, a(n) for n=0..12.

Crossrefs

Sequence in context: A336174 A045905 A012680 * A234004 A053587 A052346

Adjacent sequences: A012681 A012682 A012683 * A012685 A012686 A012687

Keyword

sign

Author

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

Status

approved