A013098 tanh(arcsinh(x)+tan(x)) = 2*x-15/3!*x^3+457/5!*x^5-30289/7!*x^7...

2, -15, 457, -30289, 3469345, -608926329, 151766090881, -50946876706129, 22157750605438913, -12118460218882345193, 8139938757873193425313, -6587354373887296232631681, 6321346340322177807347908193

Offset

0,1

Links

Vaclav Kotesovec, Table of n, a(n) for n = 0..200

Formula

Limit n->infinity (|a(n)|/(2*n+1)!)^(1/(2*n+1)) = 1.2646735395769... - Vaclav Kotesovec, Nov 01 2013

Mathematica

Table[n!*SeriesCoefficient[Tanh[ArcSinh[x]+Tan[x]], {x, 0, n}], {n, 1, 41, 2}] (* Vaclav Kotesovec, Nov 01 2013 *)

Crossrefs

Sequence in context: A012943 A363834 A013059 * A365534 A158109 A370014

Adjacent sequences: A013095 A013096 A013097 * A013099 A013100 A013101

Keyword

sign

Author

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

Status

approved