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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 76 |
| 4 | 1406 |
| 5 | 32531 |
| 6 | 874407 |
| 7 | 26234503 |
| 8 | 857727024 |
| 9 | 30087607090 |
| 10 | 1120358453641 |
| 11 | 43948073274103 |
| 12 | 1805827523343241 |
| 13 | 77390779901965470 |
| 14 | 3447553371343457810 |
| 15 | 159209478315871014816 |
| 16 | 7605143367385966288569 |
[1,1,6,76,1406,32531,874407,26234503,857727024, 30087607090,1120358453641,43948073274103, 1805827523343241,77390779901965470, 3447553371343457810,159209478315871014816, 7605143367385966288569] |