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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 18 |
| 6 | 12 |
| 7 | 21 |
| 8 | 102 |
| 9 | 202 |
| 10 | 826 |
| 11 | 708 |
| 12 | 502 |
| 13 | 1522 |
| 14 | 6223 |
| 15 | 3493 |
| 16 | 1063 |
| 17 | 50655 |
| 18 | 10051 |
| 19 | 328426 |
[1,1,1,1,1,18,12,21,102,202,826,708,502,1522,6223, 3493,1063,50655,10051,328426] |