n=int(input())
X=[]
for i in range(n):
    s=input()
    X.append(s)

cnt=0
for i in range(2**(2*n-2)):
    I=[]
    for j in range(2*n-2):
        I.append(i%2)
        i//=2
    if sum(I)!=n-1:
        continue
    x=0
    y=0
    C=[X[x][y]]
    for j in I:
        if j:
            x+=1
        else:
            y+=1
        C.append(X[x][y])
    #print(C)
    for j in range(len(C)):
        if C[j]!=C[-j-1]:
            break
    else:
        cnt+=1
        
print(cnt)