OFFSET
1,2
FORMULA
G.f.: 1/(2*x)-sqrt(sqrt(-16*x^2-8*x+1)+4*x+3)/(4*x).
D-finite with recurrence +n*(n+1)*a(n) -4*n*(2*n-1)*a(n-1) -4*(2*n-1)*(2*n-3)*a(n-2)=0. - R. J. Mathar, Apr 24 2024
MATHEMATICA
CoefficientList[Series[1/(2*x)-Sqrt[Sqrt[-16*x^2-8*x+1]+4*x+3]/(4*x), {x, 0, 20}], x] (* Stefano Spezia, Apr 22 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Kruchinin, Apr 22 2024
STATUS
approved