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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 92 |
| 4 | 1240 |
| 5 | 18278 |
| 6 | 285384 |
| 7 | 4638348 |
| 8 | 77652024 |
| 9 | 1329890705 |
| 10 | 23190029720 |
| 11 | 410333440536 |
| 12 | 7349042994488 |
| 13 | 132969010888280 |
| 14 | 2426870706415800 |
| 15 | 44627576949364104 |
| 16 | 826044435409399800 |
| 17 | 15378186970730687400 |
[1,1,8,92,1240,18278,285384,4638348,77652024, 1329890705,23190029720,410333440536,7349042994488, 132969010888280,2426870706415800, 44627576949364104,826044435409399800, 15378186970730687400] |