OFFSET
0,1
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 0..100
Ozaner Hansha, The Dottie Number.
Ozaner Hansha, Kaplan's series.
Samuel R. Kaplan, The Dottie Number, Mathematics Magazine, Vol. 80, No. 1 (2007), pp. 73-74, alternative link.
EXAMPLE
The Kaplan series begins with d = Pi/4 - Pi^3/768 - Pi^5/61440 - 43*Pi^7/165150720 - ...
MATHEMATICA
f[x_] := x - Cos[x]; g[x_] := InverseFunction[f][x]; s = {}; Do[AppendTo[s, Denominator[(-1/2)^n * 1/n! * Derivative[n][g][Pi/2]]], {n, 1, 30, 2}]; s
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Amiram Eldar, Feb 01 2019
STATUS
approved