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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 29 |
| 4 | 165 |
| 5 | 593 |
| 6 | 2773 |
| 7 | 11093 |
| 8 | 48605 |
| 9 | 201829 |
| 10 | 864901 |
| 11 | 3638261 |
| 12 | 15472261 |
| 13 | 65377669 |
| 14 | 277294885 |
| 15 | 1173523013 |
| 16 | 4972873413 |
| 17 | 21056700293 |
| 18 | 89200845765 |
| 19 | 377774394309 |
| 20 | 1600161267781 |
| 21 | 6777276186821 |
| 22 | 28705824305861 |
| 23 | 121582507360709 |
[1,1,11,29,165,593,2773,11093,48605,201829,864901, 3638261,15472261,65377669,277294885,1173523013, 4972873413,21056700293,89200845765,377774394309, 1600161267781,6777276186821,28705824305861, 121582507360709] |