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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 5 |
| 4 | 9 |
| 5 | 21 |
| 6 | 65 |
| 7 | 321 |
| 8 | 1383 |
| 9 | 7221 |
| 10 | 40414 |
| 11 | 245312 |
| 12 | 1552223 |
| 13 | 10217560 |
| 14 | 69410576 |
| 15 | 485081195 |
| 16 | 3473135825 |
[0,3,5,9,21,65,321,1383,7221,40414,245312,1552223, 10217560,69410576,485081195,3473135825] |