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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 102 |
| 6 | 165 |
| 7 | 279 |
| 8 | 474 |
| 9 | 504 |
| 10 | 834 |
| 11 | 921 |
| 12 | 2017 |
| 13 | 4434 |
| 14 | 4458 |
| 15 | 7614 |
| 16 | 8557 |
| 17 | 17163 |
| 18 | 22800 |
[0,1,3,6,102,165,279,474,504,834,921,2017,4434, 4458,7614,8557,17163,22800] |