OFFSET
0,2
COMMENTS
Inspired by the Demichel sequences.
Coefficients are multiplied by (n+1)! and rounded to the nearest integer. First fraction occurs at degree 11 ( 18455713503 = round(129189994524/7) ).
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..100
EXAMPLE
arccosh(exp(3*x) - sin(3*x)) = 6*x/2! + 18*x^2/3! - 36*x^3/4! + ...
MATHEMATICA
Round[Table[(i+1)!, {i, 0, 20}]*CoefficientList[Assuming[x > 0, Series[ArcCosh[Exp[3 x] - Sin[3 x]], {x, 0, 20}]], x]]
CROSSREFS
KEYWORD
sign
AUTHOR
Olivier Gérard, Dec 18 2011
STATUS
approved