#define MD 998244353
ll@n,@m,@k;
if(m==1){
	wt(1<<n);
	exit(0);
}
Matrix<Mint>a(n+1-k,n+1-k);
Comb<Mint>c;
rep(y,n+1-k){
	rep(x,n+1-k){
		a[y][x]=sum[i,0,x+1](c.C(k+y,k+i)*c.C(n-(k+y),x-i));
	}
}
a**=m;
wt(sum(a[n-k](n-k+1)));