KöMaL 2009 B4172

Let $n$ be a positive integer and let $k_1, k_2, k_3,\ldots,k_n$ denote an arbitrary order of the integers 1 to $n$. What is the largest possible value of the expression (1-$k_1$)$^2$+(2-$k_2$)$^2$+(3-$k_3$)$^2$+...+($n$-$k_n$)$^2$ of $n$ terms?