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 | 13 |
| 2 | 97 |
| 3 | 809 |
| 4 | 6737 |
| 5 | 56549 |
| 6 | 475809 |
| 7 | 4008817 |
| 8 | 33795201 |
| 9 | 284980061 |
| 10 | 2403420097 |
| 11 | 20270798553 |
| 12 | 170971640209 |
| 13 | 1442058561397 |
| 14 | 12163101107393 |
| 15 | 102590452275041 |
| 16 | 865306832676993 |
| 17 | 7298499493581101 |
| 18 | 61559793235182241 |
| 19 | 519231197740651273 |