An Explicit Conjectured Determinant Evaluation Whose Proof Would Make Me   Happy (and the OEIS richer)
  I conjecture a certain explicit determinant evaluation, whose proof would imply the solution of certain enumeration problem that I have been working on, and that I find interesting. I am pledging \$500 to the OEIS Foundation (in honor of the prover!) for a proof, and \$50 (in honor of the disprover) 
Doron Zeilberger
math.CO