#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001LL

int main(){
	
	int n;
	cin>>n;
	vector<string> s(n);
	rep(i,n)cin>>s[i];
	if(s[0][0]!=s[n-1][n-1]){
		cout<<0<<endl;
		return 0;
	}
	vector dp(1,vector<mint>(1,1));
	for(int i=1;i<n;i++){
		vector ndp(i+1,vector<mint>(i+1));
		rep(j,dp.size()){
			rep(k,dp.size()){
				int x = j,y = i-1-j,z = n-i+k;
				int w = n-1-k;
				rep(l,2){
					rep(m,2){
						int nx = x,ny = y,nz = z,nw = w;
						if(l==0)nx++;
						else ny++;
						if(m==0)nz--;
						else nw--;
						if(s[nx][ny]!=s[nz][nw])continue;
						ndp[nx][nz-n+(i+1)] += dp[j][k];
					}
				}
			}
		}
		swap(dp,ndp);
		
	}
	mint ans = 0;
	rep(i,dp.size())ans += dp[i][i];
	cout<<ans.val()<<endl;
	return 0;
}