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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 63 |
| 3 | 126 |
| 4 | 2772 |
| 5 | 46416 |
| 6 | 401922 |
| 7 | 241723 |
| 8 | 21544131 |
| 9 | 41212853 |
| 10 | 2910219048 |
| 11 | 149105337881 |
[1,16,63,126,2772,46416,401922,241723,21544131, 41212853,2910219048,149105337881] |