A012140 arcsinh(arcsin(arctanh(x)))=x+2/3!*x^3+32/5!*x^5+1336/7!*x^7...

1, 2, 32, 1336, 108800, 14701312, 2986596480, 852635258112, 325714440802304, 160437668874481664, 98998538588401238016, 74780329820590921056256, 67860526461080359727955968, 72835853250644384064569933824

Offset

0,2

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSinh[ArcSin[ArcTanh[x]]], {x, 0, nn}], x] Range[ 0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jan 09 2023 *)

Crossrefs

Sequence in context: A012093 A012214 A320419 * A268557 A281183 A012209

Adjacent sequences: A012137 A012138 A012139 * A012141 A012142 A012143

Keyword

nonn

Author

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

Status

approved