  We prove a recent conjecture due to Deutsch, Sagan, and Wilson stating that
the finite sequence obtained from the first p central trinomial coefficients
modulo p by replacing nonzero terms by 1's is palindromic, for any prime number
p > 3.
  Addendum: the result was proved before almost in the same way by Tony D. Noe:
  On the Divisibility of Generalized Central Trinomial Coefficients,
  Journal of Integer Sequences, Vol. 9 (2006), Article 06.2.7
http://www.cs.uwaterloo.ca/journals/JIS/VOL9/Noe/noe35.html
