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 | 5 |
| 2 | 17 |
| 3 | 55 |
| 4 | 293 |
| 5 | 2141 |
| 6 | 445 |
| 7 | 457 |
| 8 | 5153 |
| 9 | 131597 |
| 10 | 1745411 |
| 11 | 1772711 |
| 12 | 30586537 |
| 13 | 31024117 |
| 14 | 597115873 |
| 15 | 604577173 |
| 16 | 14050770329 |
| 17 | 99311504603 |
| 18 | 100230122303 |
| 19 | 101081931443 |
| 20 | 101903852543 |