n=int(input()) m=[[0 for _ in range(n) ] for _ in range(n)] #被0填满的二维列表 #c = [0 for _ in range(5)] #列表名=[预设元素 for _ in range(列表长度)] if n==1: print(" "+str(1)) else: x,y = 0,n-1 m[x][y]=1 dx = [1,0,-1,0] dy = [0,-1,0,1] d = 0 for i in range(2,n*n+1): next_x=x + dx[d] next_y=y + dy[d] if not(0<=next_x<n)or not(0<=next_y<n) or m[next_x][next_y]!=0: d = (d+1)%4 next_x=x + dx[d] next_y=y + dy[d] x,y=next_x,next_y#每次变化都记录 m[x][y]=i for i in range(n): for j in range(n): print(m[i][j],end=" ") print()