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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 21 |
| 4 | 31 |
| 5 | 6257 |
| 6 | 10293 |
| 7 | 279025 |
| 8 | 483127 |
| 9 | 435506703 |
| 10 | 776957575 |
| 11 | 22417045555 |
| 12 | 40784671953 |
| 13 | 9569130097211 |
| 14 | 17652604545791 |
| 15 | 523910972020563 |
| 16 | 976501268709949 |
| 17 | 935823746406530603 |
| 18 | 1758220447807291611 |