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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 33 |
| 4 | 726 |
| 5 | 25236 |
| 6 | 1229328 |
| 7 | 78167484 |
| 8 | 6193726506 |
| 9 | 592068123054 |
| 10 | 66673324219176 |
| 11 | 8685890001564984 |
| 12 | 1290531658541292252 |
| 13 | 216188985806157611520 |
| 14 | 40449991773179254230432 |
| 15 | 8386998677130790903212000 |
| 16 | 1914263814914709029067344724 |
| 17 | 478208364783447353623777136772 |
[1,1,3,33,726,25236,1229328,78167484,6193726506, 592068123054,66673324219176,8685890001564984, 1290531658541292252,216188985806157611520, 40449991773179254230432,8386998677130790903212000, 1914263814914709029067344724, 478208364783447353623777136772] |