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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 216 |
| 4 | 8181 |
| 5 | 489753 |
| 6 | 43073059 |
| 7 | 5251140144 |
| 8 | 847811871333 |
| 9 | 175006259417547 |
| 10 | 44939475107574752 |
| 11 | 14046429669829943012 |
| 12 | 5249989348656458769520 |
| 13 | 2312011774544840687484876 |
| 14 | 1184766852578716585055014620 |
| 15 | 698927709348312453031204116720 |
[1,1,10,216,8181,489753,43073059,5251140144, 847811871333,175006259417547,44939475107574752, 14046429669829943012,5249989348656458769520, 2312011774544840687484876, 1184766852578716585055014620, 698927709348312453031204116720] |