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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 15 |
| 5 | 56 |
| 6 | 102 |
| 7 | 198 |
| 8 | 228 |
| 9 | 234 |
| 10 | 280 |
| 11 | 312 |
| 12 | 528 |
| 13 | 672 |
| 14 | 756 |
| 15 | 1050 |
| 16 | 1320 |
[1,3,9,15,56,102,198,228,234,280,312,528,672,756, 1050,1320] |