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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 37 |
| 3 | 173 |
| 4 | 785 |
| 5 | 3137 |
| 6 | 12897 |
| 7 | 51897 |
| 8 | 207037 |
| 9 | 831069 |
| 10 | 3326637 |
| 11 | 13308985 |
| 12 | 53275677 |
| 13 | 213108805 |
| 14 | 852561341 |
| 15 | 3410229225 |
[1,5,37,173,785,3137,12897,51897,207037,831069, 3326637,13308985,53275677,213108805,852561341, 3410229225] |