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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 87 |
| 3 | 1173 |
| 4 | 17271 |
| 5 | 251595 |
| 6 | 3669765 |
| 7 | 53519163 |
| 8 | 780527655 |
| 9 | 11383251453 |
| 10 | 166013909415 |
| 11 | 2421155095347 |
| 12 | 35310246222069 |
| 13 | 514966385300499 |
| 14 | 7510295349852327 |
| 15 | 109530520538219973 |
| 16 | 1597398553655896551 |
[3,87,1173,17271,251595,3669765,53519163, 780527655,11383251453,166013909415,2421155095347, 35310246222069,514966385300499,7510295349852327, 109530520538219973,1597398553655896551] |