a binomial sum.

[Marc LeBrun]

 >=Robert G. Wilson v
 > I even tried super seeker and it did not find A072547. Bob.

That's strange, because I said

   lookup 1 -1 7 -21 81 -295 1107 -4165 15793 -60171 230253 -884235 3406105 
-13154947 50922987 -197519941 767502945

and got back

   Report on [ 
1,-1,7,-21,81,-295,1107,-4165,15793,-60171,230253,-884235,3406105]:
...
           SUCCESS
           (limited to 40 matches):
   Transformation T041 gave a match with:
   %I A072547
...

So the question is WHY did our experiences differ?  Typo?  Something 
broken?  ???