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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 6 |
| 9 | 35 |
| 10 | 150 |
| 11 | 627 |
| 12 | 2318 |
| 13 | 8400 |
| 14 | 28624 |
| 15 | 96049 |
| 16 | 311002 |
| 17 | 994899 |
| 18 | 3111570 |
| 19 | 9638347 |
| 20 | 29398762 |
| 21 | 88985840 |
| 22 | 266359752 |
| 23 | 792360385 |
| 24 | 2337329116 |
| 25 | 6859721431 |
[1,6,35,150,627,2318,8400,28624,96049,311002, 994899,3111570,9638347,29398762,88985840, 266359752,792360385,2337329116,6859721431] |