A009786 Expansion of tanh(log(1+x)/cos(x)).

0, 1, -1, 3, 0, -45, 465, -3759, 22232, -70059, -1060245, 28407599, -453971496, 5589320503, -48353999603, 7539772397, 12427981991760, -374837737029719, 7794717166601847, -122407621058565797, 1113301750728210320

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Mathematica

Tanh[ Log[ 1+x ]/Cos[ x ] ]

Crossrefs

Sequence in context: A164806 A105751 A177698 * A012738 A193410 A271762

Adjacent sequences: A009783 A009784 A009785 * A009787 A009788 A009789

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved