|
|
A131136
|
|
Denominator of (exponential) expansion of log((x/2-1)/(x-1)).
|
|
4
|
|
|
1, 2, 4, 4, 8, 4, 8, 8, 16, 4, 8, 8, 16, 8, 16, 16, 32, 4, 8, 8, 16, 8, 16, 16, 32, 8, 16, 16, 32, 16, 32, 32, 64, 4, 8, 8, 16, 8, 16, 16, 32, 8, 16, 16, 32, 16, 32, 32, 64, 8, 16, 16, 32, 16, 32, 32, 64, 16, 32, 32, 64, 32, 64, 64, 128, 4, 8, 8, 16, 8, 16, 16, 32, 8, 16, 16
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 0^n + n + Sum_{k=0..n-1} (-1)^(1 + binomial(n-1,k)). - Stephen Crowley, Aug 25 2008
|
|
EXAMPLE
|
May be written as a triangle by using the Crowley formula with A063787:
.1;
.2;
.4,4;
.8,4,8,8;
.16,4,8,8,16,8,16,16;
.32,4,8,8,16,8,16,16,32,8,16,16,32,16,32,32;
.64,4,8,8,16,8,16,16,32,8,16,16,32,16,32,32,64,8,16,16,32,16,32,32,64,16,...
Also
1,
2,
4,
4,8,
4,8,8,16,
4,8,8,16,8,16,16,32,
4,8,8,16,8,16,16,32,8,16,16,32,16,32,32,64,
4,8,8,16,8,16,16,32,8,16,16,32,16,32,32,64,8,16,16,32,16,32,32,64,16,32,...
(End)
|
|
MAPLE
|
a(n)=abs(op(1, numer(expand(Zeta(2n)/Zeta(1-2n))))) # Stephen Crowley, Aug 25 2008
|
|
MATHEMATICA
|
With[{nn=80}, Denominator[CoefficientList[Series[Log[(x/2-1)/(x-1)], {x, 0, nn}], x] Range[0, nn]!]] (* Harvey P. Dale, Apr 28 2016 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|