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 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 137 |
| 5 | 1817 |
| 6 | 20297 |
| 7 | 350627 |
| 8 | 8518787 |
| 9 | 86116307 |
| 10 | 5886530927 |
| 11 | 193507634597 |
| 12 | 6210322338497 |
| 13 | 124942132495457 |
| 14 | 3471695031294767 |
| 15 | 42719979026304857 |
| 16 | 3117168891968761907 |
| 17 | 850435289298909924887 |
| 18 | 91220171746546903961177 |