OFFSET
0,4
COMMENTS
The inner function is sech(x) - log(1+x) = 1 - x - x^3/3 + 11*x^4/24 - x^5/5 + 59*x^6/720 - x^7/7 + ... = 1 - x/1! + 0*x^2/2! - 2*x^3/3! + 11*x^4/4! - 24*x^5/5! + 59*x^6/6! - ...
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..200
EXAMPLE
x + 1/2!*x^2 + 4/3!*x^3 + 3/4!*x^4 + 33/5!*x^5 ...
MATHEMATICA
CoefficientList[Series[-Log[Sech[x]-Log[x+1]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Nov 12 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Offset and another leading 1 from R. J. Mathar, Dec 22 2011
a(0)=0 prepended by Vaclav Kotesovec, Nov 12 2016
STATUS
approved