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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 90 |
| 4 | 1162 |
| 5 | 17435 |
| 6 | 310193 |
| 7 | 6286826 |
| 8 | 144750451 |
| 9 | 3717959194 |
| 10 | 105725550762 |
| 11 | 3293914191401 |
| 12 | 111659484775650 |
| 13 | 4089936343858976 |
| 14 | 160992739588472076 |
| 15 | 6776415674628574634 |
| 16 | 303714862444753023205 |
| 17 | 14439925495117621425535 |
[1,1,9,90,1162,17435,310193,6286826,144750451, 3717959194,105725550762,3293914191401, 111659484775650,4089936343858976, 160992739588472076,6776415674628574634, 303714862444753023205,14439925495117621425535] |