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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 71 |
| 4 | 877 |
| 5 | 11437 |
| 6 | 140179 |
| 7 | 1567562 |
| 8 | 16444269 |
| 9 | 158993052 |
| 10 | 1448222849 |
| 11 | 12807964358 |
[1,6,71,877,11437,140179,1567562,16444269, 158993052,1448222849,12807964358] |