The odds to hit at each position, from the center outwards are

1:5.092, 1:5.729, 1:8.184, 1:15.004, 1:36.009, 1:117.029, 1:546.133, 1:4,096, 1:65,536

That is assuming you consider being 1 left of center not the same result of 1 right of center and so on. Double the odds of all but the center if you're using a mirrored row.