Score : $1800$ points
Given is an integer $N$. How many permutations $(P_0,P_1,\cdots,P_{2N-1})$ of $(0,1,\cdots,2N-1)$ satisfy the following condition?
Since the number can be enormous, compute it modulo $M$.
Input is given from Standard Input in the following format:
$N$ $M$
Print the number of permutations that satisfy the condition, modulo $M$.
2 998244353
4
Four permutations satisfy the condition:
10 998244353
53999264
200 998244353
112633322