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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 6 |
| 5 | 84 |
| 6 | 344 |
| 7 | 1594 |
| 8 | 2104 |
| 9 | 6385 |
| 10 | 9118 |
| 11 | 9331 |
| 12 | 14706 |
| 13 | 72559 |
[0,1,4,6,84,344,1594,2104,6385,9118,9331,14706, 72559] |