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 | 31 |
| 2 | 961 |
| 3 | 4719 |
| 4 | 24317 |
| 5 | 175903 |
| 6 | 891720 |
| 7 | 4094666 |
| 8 | 21072638 |
| 9 | 99746042 |
| 10 | 440141222 |
| 11 | 2003254604 |
| 12 | 8937597494 |
| 13 | 38381074339 |
| 14 | 165425593855 |
| 15 | 709144263593 |
| 16 | 2981321572403 |
| 17 | 12486729646315 |
| 18 | 52162085656079 |
| 19 | 215733902493821 |