Instructions: You are given a list of integers and an integer target, return a list of a pair of numbers in any order such that they add up to target. If there is no such pair of numbers, then return an empty list
Input: [8, 46, 34, 18, 44, 31, 41, 40, 11, 24, 26, 19, 47, 27, 13, 9, 7, 36, 30, 20], target=51
Output:
[40, 11]