A029646 Odd numbers to the left of the central elements of the (1,2)-Pascal triangle A029635.

1, 1, 1, 1, 5, 1, 1, 7, 1, 27, 1, 9, 35, 77, 1, 1, 11, 1, 65, 1, 13, 77, 275, 1, 935, 1, 15, 1287, 2717, 1, 119, 1729, 7007, 1, 17, 135, 665, 2275, 5733, 11011, 16445, 1, 1, 19, 1, 189, 1, 21, 209, 1311, 1, 7125, 1, 23, 8645, 32319, 1, 275, 10395, 127281, 1, 25, 299, 2277