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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 173 |
| 4 | 3321 |
| 5 | 81529 |
| 6 | 2443333 |
| 7 | 86475493 |
| 8 | 3529941873 |
| 9 | 163260749681 |
| 10 | 8437633695741 |
| 11 | 481912844592541 |
| 12 | 30142773978386281 |
| 13 | 2049173019206244073 |
| 14 | 150443505029536707381 |
| 15 | 11862692305729094644949 |
| 16 | 999864950902004743707873 |
| 17 | 89709634016056661732903137 |
[1,1,13,173,3321,81529,2443333,86475493, 3529941873,163260749681,8437633695741, 481912844592541,30142773978386281, 2049173019206244073,150443505029536707381, 11862692305729094644949,999864950902004743707873, 89709634016056661732903137] |