[seqfan] definition of double factorial

[Karol]

This is to inform you that the definition of double factorial numbers
  as given in A001147(n) and  in related sequences as A001818(n)  etc.  
disagrees with Maple's
    function doublefactorial(n). I do not know if this point was raised 
before.
  As this may lead to inconsistencies  I intend to submit a comment on it.

             Karol A.Penson