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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 9 |
| 7 | 6 |
| 8 | 79 |
| 9 | 16 |
| 10 | 219 |
| 11 | 580 |
| 12 | 387 |
| 13 | 189 |
| 14 | 7067 |
| 15 | 1803 |
| 16 | 6582 |
| 17 | 31917 |
| 18 | 18888 |
| 19 | 20973 |
| 20 | 132755 |
| 21 | 11419 |
| 22 | 50111 |
[1,1,1,2,5,9,6,79,16,219,580,387,189,7067,1803, 6582,31917,18888,20973,132755,11419,50111] |