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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 120 |
| 4 | 3516 |
| 5 | 166328 |
| 6 | 11532458 |
| 7 | 1100805591 |
| 8 | 138367161579 |
| 9 | 22150155031528 |
| 10 | 4399449078063293 |
| 11 | 1061636331152735214 |
| 12 | 305921694251090263429 |
| 13 | 103759120501255220937827 |
| 14 | 40916086296549562038319264 |
| 15 | 18562249570081891918836678474 |
| 16 | 9599588267110033395243891612720 |
[1,1,8,120,3516,166328,11532458,1100805591, 138367161579,22150155031528,4399449078063293, 1061636331152735214,305921694251090263429, 103759120501255220937827, 40916086296549562038319264, 18562249570081891918836678474, 9599588267110033395243891612720] |