No 3 in line problem

[franktaw at netscape.net]

http://www.research.att.com/~njas/sequences/A000769.

The Extensions contains the statement "It is known that a(n)=0 for all 
sufficiently large n."  However, I can find no support for this 
statement from any of the referenced web sites, nor any other web sites 
I could find - all refer to it as a conjecture.  Since none of the 
references is more recent than 1998, I doubt that any them prove this, 
either.

Is this really known?  If so, what is the reference?

Franklin T. Adams-Watters

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