307898: CF1431J. Zero-XOR Array

You are given an array of integers $a$ of size $n$. This array is non-decreasing, i. e. $a_1 \le a_2 \le \dots \le a_n$.

You have to find arrays of integers $b$ of size $2n - 1$, such that:

• $b_{2i-1} = a_i$ ($1 \le i \le n$);
• array $b$ is non-decreasing;
• $b_1 \oplus b_2 \oplus \dots \oplus b_{2n-1} = 0$ ($\oplus$ denotes bitwise XOR operation: https://en.wikipedia.org/wiki/Exclusive_or. In Kotlin, it is xor function).

Calculate the number of arrays that meet all the above conditions, modulo $998244353$.

The first line contains a single integer $n$ ($2 \le n \le 17$) — the size of the array $a$.

The second line contains $n$ integers ($0 \le a_i \le 2^{60} - 1; a_i \le a_{i+1}$) — elements of the array $a$.

Print a single integer — the number of arrays that meet all the above conditions, modulo $998244353$.

3
0 1 3

2

4
0 3 6 7

6

5
1 5 9 10 23

20

10
39 62 64 79 81 83 96 109 120 122

678132