import sys
input = sys.stdin.readline

N=int(input())
C=[input().strip() for i in range(N)]

if C[0][0]!=C[-1][-1]:
    print(0)
    exit()

DP=[[1]]

for i in range(N-1):
    NDP=[[0]*(i+2) for j in range(i+2)]

    for j in range(i+1):
        for k in range(i+1):
            now=DP[j][k]

            a=j
            b=i-j

            c=N-1-k
            d=N-1-(i-k)

            if i==N-2:
                for x,y in [(a+1,b),(a,b+1)]:
                    if 0<=x<N and 0<=y<N:
                        for z,w in [(c-1,d),(c,d-1)]:
                            if 0<=z<N and 0<=w<N:
                                if x==z and y==w:
                                    NDP[x][N-1-z]+=now

            else:
                for x,y in [(a+1,b),(a,b+1)]:
                    if 0<=x<N and 0<=y<N:
                        for z,w in [(c-1,d),(c,d-1)]:
                            if 0<=z<N and 0<=w<N:
                                if C[x][y]==C[z][w]:
                                    NDP[x][N-1-z]+=now

            

    DP=NDP

#print(DP)

ANS=0
for s in DP:
    ANS+=sum(s)

print(ANS)