t =

0

1

2

3

4

r = 2

s = 0

2

4

9

16

29

r = 2

s = 1

4

11

26

52

98

r = 2

s = 2

9

26

66

137

269

r = 2

s = 3

16

52

137

300

606

r = 2

s = 4

29

98

269

606

1259