OFFSET
0,3
MATHEMATICA
Differences[CoefficientList[Series[(1-3 x+x^2-Sqrt[1-6 x+7 x^2-2 x^3+x^4])/(2 x), {x, 0, 40}], x]] (* Harvey P. Dale, Jun 08 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 24 2016
STATUS
approved