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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 14 |
| 4 | 184 |
| 5 | 16906 |
| 6 | 2442118 |
| 7 | 1435139134 |
| 8 | 2019636259814 |
| 9 | 7941042712515578 |
[1,0,2,14,184,16906,2442118,1435139134, 2019636259814,7941042712515578] |