A009655 Expansion of tan(log(1+x)^2).

0, 0, 2, -6, 22, -100, 788, -8568, 103416, -1307808, 17722512, -264361680, 4373968080, -79413478560, 1558387903200, -32713320769920, 731007454396800, -17347090012492800, 436154519763744000, -11585396062022112000

Offset

0,3

Links

Table of n, a(n) for n=0..19.

Example

tan(log(x+1)^2) = 2/2!*x^2-6/3!*x^3+22/4!*x^4-100/5!*x^5...

Mathematica

Tan[ Log[ 1+x ]^2 ]

Crossrefs

Sequence in context: A009585 A012267 A012268 * A002772 A000140 A079263

Adjacent sequences: A009652 A009653 A009654 * A009656 A009657 A009658

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved