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 | 3 |
| 3 | 7 |
| 4 | 23 |
| 5 | 199 |
| 6 | 2297 |
| 7 | 3473 |
| 8 | 124311 |
| 9 | 262193 |
| 10 | 580011 |
| 11 | 2847499 |
| 12 | 16329689 |
| 13 | 115495383 |
| 14 | 399128719 |
| 15 | 13657103441 |
| 16 | 16022594389 |
| 17 | 66275713667 |
| 18 | 733100630963 |
| 19 | 1291428223783 |
| 20 | 5340370800707 |