Pattern generator: 1 1 2 2 3 3 4 4 5 4 4 3 3 2 2 1 1

def pattern(n):
    for i in range(n):
        for j in range(n):
            if j <= i:
                print(j+1, end="")
            else:
                print(" ", end="")
        for k in range(n-1, -1, -1):
            if k <= i:
                print(" ", end="")
            else:
                print(k+1, end="")
        print()

pattern(5)