Let \(M_n=(a_{ij})_{ij}\) be an \(n\times n\) matrix such that \[a_{ij}=\binom{2(i+j-1)}{i+j-1}.\] What is \(\det M_n\)?

The best solution was submitted by Koon, Yun Bum (국윤범, 수리과학과 2015학번). Congratulations!

Here is his solution of problem 2016-22.

Alternative solutions were submitted by 신준형 (수리과학과 2015학번, +3), 장기정 (수리과학과 2014학번, +3), 이상민 (수리과학과 2014학번, +3), 채지석 (2016학번, +3), 이시우 (포항공대 수학과 2013학번, +3), 홍진표 (서울대학교 재료공학부 2013학번, +3).