Mathematics is an important subject in ancient science in China, with a long history and brilliant achievements. Take a look at
Update 1: When n = 1
L.H.S. = 1? + 2? = 9 R.H.S. = 1? 3? Can you explain it to me? ...
Update 2: L.H.S. = 1? + 2? + 3? +...+ (2k)? + (2k + 1)? + (2k + 2)? E is not clear