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 | 3 |
| 2 | 111 |
| 3 | 13203 |
| 4 | 20439 |
| 5 | 1997001 |
| 6 | 22494039 |
| 7 | 116226009 |
| 8 | 761157 |
| 9 | 278522253 |
| 10 | 206613747 |
| 11 | 17677747557 |
| 12 | 835525881 |
| 13 | 12933400720959 |
| 14 | 228717562653 |
| 15 | 5465090439 |
| 16 | 13095850041 |
| 17 | 431138536893 |
| 18 | 4734551277 |
| 19 | 58199580096201 |
| 20 | 59875330325409 |
| 21 | 228520359 |
| 22 | 3003003 |
| 23 | 257494085001 |
| 24 | 1029221499627 |
| 25 | 136635497220969 |