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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 207 |
| 4 | 6620 |
| 5 | 288040 |
| 6 | 15891234 |
| 7 | 1063219640 |
| 8 | 83665143176 |
| 9 | 7572321823536 |
| 10 | 775010639465040 |
| 11 | 88510236140283672 |
| 12 | 11158965455394331992 |
| 13 | 1539441941412714237912 |
| 14 | 230675631266761375815288 |
| 15 | 37309025609545822539225240 |
| 16 | 6478248637390494598048444224 |
[1,1,10,207,6620,288040,15891234,1063219640, 83665143176,7572321823536,775010639465040, 88510236140283672,11158965455394331992, 1539441941412714237912,230675631266761375815288, 37309025609545822539225240, 6478248637390494598048444224] |