Answer:
8, 18, 11, 15, 5, 4, 14, 9, 19, 1, 7, 17, 6, 16, 10, 13, 3, 12, 2
Explanation:
I've seen this one before. No numbers can be repeated and the only numbers used are in the range of 1-19. The answer does not follow any mathematical rule, and it is best to think of the numbers as words so it is easier to write them out.
E ight
E ighteen
E leven
F ifteen
F our
F ourteen
N ineteen
O ne
S even
S eventeen
S ix
S ixteen
T en
T hirteen
T hree
T welve
T wo