Initial:

−3h² + 2h

−8h² + 2h

−15h² + 2h

−24h² + 2h

−35h² + 2h

…

1^st diff:

5h²

7h²

9h²

11h²

…

2^nd diff:

2h²

2h²

2h²

…

3^rd diff:

0

0

…