[seqfan] Re: Zeros in A172390 and A172391

[Joerg Arndt]

* Joerg Arndt <arndt at jjj.de> [Mar 23. 2010 06:52]:
> [...]
> 
> Interesting.  I don't think this is known.
> I'll think more about this.
> 


It appears that if the 'odd' term 8*x, i.e.
A172390  1, 8, 24, 0, -168, 0, 2112, 0, -32040, 0, 536256, ...
            ^
         this one

is removed then the series is a 4th power of
another one that has all integer coefficients.
Whether this is just another way of putting
the conjecture in question I do not know.


> 
> [...]