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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 31 |
| 3 | 691 |
| 4 | 18054 |
| 5 | 515892 |
| 6 | 15615159 |
| 7 | 492007235 |
| 8 | 15968172965 |
| 9 | 530169356965 |
| 10 | 17922457144129 |
| 11 | 614796956579459 |
| 12 | 21346411113410148 |
| 13 | 748762981653051898 |
| 14 | 26493592534823331169 |
| 15 | 944491728494004127029 |
| 16 | 33892155096781949014406 |
| 17 | 1223212951343094980654244 |
[1,2,31,691,18054,515892,15615159,492007235, 15968172965,530169356965,17922457144129, 614796956579459,21346411113410148, 748762981653051898,26493592534823331169, 944491728494004127029,33892155096781949014406, 1223212951343094980654244] |