$S/N$

c

$E\left[N\right]$

1

0

1.000000

2

3

0.500000

3

5

0.187500

4

7

0.062500

5

9

0.019531

6

10

0.010742

7

11

0.005859

8

13

0.001709

9

14

0.000916

10

15

0.0004883