#define MD 998244353
{
Comb<Mint>c;
c.expand_fact(1d5);
int @n;
Mint @m;
int @k;
Mint w=c.fac(m)*c.ifac(m-k);
Mint z;
REP(i,k+1)z=m**n*c.ifac(i)*c.ifac(k-i)-z,m+=1;
wt(z*w);
}