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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 121 |
| 4 | 2289 |
| 5 | 56401 |
| 6 | 1713849 |
| 7 | 61939081 |
| 8 | 2595199329 |
| 9 | 123690992161 |
| 10 | 6608289658089 |
| 11 | 391154820258841 |
| 12 | 25408740616159569 |
| 13 | 1797051730819428721 |
| 14 | 137463201511019813529 |
| 15 | 11308020549364112399401 |
| 16 | 995455518982520306979009 |
| 17 | 93373681491447943767190081 |
[1,1,9,121,2289,56401,1713849,61939081,2595199329, 123690992161,6608289658089,391154820258841, 25408740616159569,1797051730819428721, 137463201511019813529,11308020549364112399401, 995455518982520306979009, 93373681491447943767190081] |