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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 56 |
| 4 | 1024 |
| 5 | 27114 |
| 6 | 969128 |
| 7 | 44610432 |
| 8 | 2556362016 |
| 9 | 177733575120 |
| 10 | 14692805761512 |
| 11 | 1420846650571776 |
| 12 | 158583233552744064 |
| 13 | 20199186787986074400 |
| 14 | 2908060636034265554880 |
| 15 | 469318752131725598874624 |
| 16 | 84293191721843435282950656 |
[1,1,5,56,1024,27114,969128,44610432,2556362016, 177733575120,14692805761512,1420846650571776, 158583233552744064,20199186787986074400, 2908060636034265554880,469318752131725598874624, 84293191721843435282950656] |