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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 104 |
| 4 | 1647 |
| 5 | 23560 |
| 6 | 320198 |
| 7 | 4222792 |
| 8 | 54617267 |
| 9 | 696972524 |
| 10 | 8807574390 |
| 11 | 110483092984 |
| 12 | 1377998069826 |
| 13 | 17108920039328 |
| 14 | 211636362018548 |
| 15 | 2609949110616064 |
| 16 | 32104324480419131 |
[0,5,104,1647,23560,320198,4222792,54617267, 696972524,8807574390,110483092984,1377998069826, 17108920039328,211636362018548,2609949110616064, 32104324480419131] |