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# Gray Code

Problem Description

The gray code is a binary numeral system where two successive values differ in only one bit.

Given a non-negative integer A representing the total number of bits in the code, print the sequence of gray code.

A gray code sequence must begin with 0.

Problem Constraints

1 <= A <= 16

Input Format

The first argument is an integer A.

Output Format

Return an array of integers representing the gray code sequence.

Example Input

Input 1:

`A = 2`

Input 1:

`A = 1`

Example Output

output 1:

`[0, 1, 3, 2]`

output 2:

`[0, 1]`

Example Explanation

Explanation 1:

```for A = 2 the gray code sequence is:
00 - 0
01 - 1
11 - 3
10 - 2
So, return [0,1,3,2].```

Explanation 1:

```for A = 1 the gray code sequence is:
00 - 0
01 - 1
So, return [0, 1].```

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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