Python:
f= open("array.txt","w")
n=int(input())
a=[]
for i in range (n):
a.append([0]*n)
for i in range(n):
for j in range(n):
if i==j:
a[i][j]=1
for i in range(n):
for j in range(n):
a[i][j]=((i+1)+(j+1))**3
for i in range (n):
for j in range (n):
print(a[i][j], end='\t', file=f)
print(' ', file=f)
for i in range (n):
for j in range(n):
print(a[i][j], end=' ')
print(' ')