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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 11 |
| 5 | 30 |
| 6 | 62 |
| 7 | 534 |
| 8 | 620 |
| 9 | 803 |
| 10 | 2436 |
| 11 | 2669 |
| 12 | 3975 |
| 13 | 4530 |
| 14 | 4827 |
| 15 | 5294 |
| 16 | 15987 |
| 17 | 17589 |
| 18 | 51960 |
[1,2,3,11,30,62,534,620,803,2436,2669,3975,4530, 4827,5294,15987,17589,51960] |