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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 66 |
| 6 | 164 |
| 7 | 221 |
| 8 | 224 |
| 9 | 2058 |
| 10 | 3224 |
| 11 | 12284 |
| 12 | 13457 |
| 13 | 22277 |
| 14 | 22761 |
| 15 | 83381 |
[0,1,2,9,66,164,221,224,2058,3224,12284,13457, 22277,22761,83381] |