OFFSET
0,1
LINKS
Eric Weisstein's MathWorld, Polygamma Function.
Wikipedia, Polygamma Function.
EXAMPLE
Polygamma values {Pi^2/6, Pi^4/15, 8*Pi^6/63, 8*Pi^8/15, 128*Pi^10/33, ...} give numerators {1, 1, 8, 8, 128, ...} and denominators {6, 15, 63, 15, 33, ...}.
MATHEMATICA
a[n_] := PolyGamma[2n+1, 1] / Pi^(2n+2) // Denominator; Table[a[n], {n, 0, 40}]
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Jean-François Alcover, Feb 12 2015
STATUS
approved