OFFSET
1,2
MAPLE
A := proc(l, x) add(x^(l-d)/d, d=1..l-1) ; end: A145612 := proc(n) denom( A(2*n+1, 2)) ; end: seq(A145612(n), n=1..20) ; # R. J. Mathar, Aug 21 2009
MATHEMATICA
m = 2; aa = {}; Do[k = 0; Do[k = k + m^(2 r + 1 - d)/d, {d, 1, 2 r}]; AppendTo[aa, Denominator[k]], {r, 1, 30}]; aa (* Artur Jasinski *)
CROSSREFS
KEYWORD
frac,nonn
AUTHOR
Artur Jasinski, Oct 14 2008
EXTENSIONS
Edited by R. J. Mathar, Aug 21 2009
STATUS
approved