This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 11 |
| 2 | 19 |
| 3 | 41 |
| 4 | 103 |
| 5 | 281 |
| 6 | 6823 |
| 7 | 20201 |
| 8 | 14381681 |
| 9 | 387682639 |
| 10 | 94151567441 |
| 11 | 282446313703 |
| 12 | 5559069156490121 |
| 13 | 16677198879535759 |
| 14 | 50031579458738081 |
| 15 | 984770919775797277303 |
| 16 | 1144561273440060866922804472241 |
| 17 | 969773729787523912361831763509149540341223 |
| 18 | 2909321189362571427600485469182379896242601 |