x

1

2

3

4

5

6

7

8

9

10

y

6

13

24

39

58

81

108

139

174

213

1^st Difference

7

11

15

19

23

27

31

35

39

2^nd Difference

4

4

4

4

4

4

4

4

3^rd Difference

0

0

0

0

0

0

0

4^th Difference

0

0

0

0

0

0