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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 121 |
| 3 | 763 |
| 4 | 7779 |
| 5 | 58901 |
| 6 | 514945 |
| 7 | 4279111 |
| 8 | 35870939 |
| 9 | 302197213 |
| 10 | 2529537475 |
| 11 | 21265881307 |
| 12 | 178394566329 |
| 13 | 1497728421519 |
| 14 | 12572164720815 |
| 15 | 105527179560835 |
| 16 | 885843035970095 |
| 17 | 7435701167074899 |
| 18 | 62416764116955877 |
| 19 | 523932061650568927 |
[13,121,763,7779,58901,514945,4279111,35870939, 302197213,2529537475,21265881307,178394566329, 1497728421519,12572164720815,105527179560835, 885843035970095,7435701167074899, 62416764116955877,523932061650568927] |