题目描述
Problem Description
Given a sequence of length $n$, denoted as $a_1, a_2, \ldots, a_n$, initially $a_i = i$. Perform $n-1$ operations on this sequence, where the $i$-th operation involves selecting an integer $j$ uniformly at random from the range $[1, n-i]$, and then setting $a_j$ to $a_j + 2a_{n-i+1}$.
Determine the expected value of $a_1$ after all operations, modulo $998244353$.
Input Format
The first line of input contains a positive integer $T$ $(1 \leq T \leq 10^4)$, representing the number of test cases.
Following this, $T$ lines each contain a positive integer $n$ $(1 \leq n \leq 10^9)$, indicating the length of the sequence.
Output Format
Output $T$ lines, each containing an integer representing the expected value of $a_1$ modulo $998244353$.
Sample Input and Output
Sample Input #1
3
4
2
5
Sample Output #1
30
5
55
Sample Input #2
3
4
3
5
Sample Output #2
30
14
55
Sample Input #3
3
8
1
3
Sample Output #3
204
1
14
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分