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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 8 |
| 7 | 14 |
| 8 | 32 |
| 9 | 108 |
| 10 | 620 |
| 11 | 6998 |
| 12 | 180680 |
| 13 | 12950282 |
| 14 | 3341374218 |
| 15 | 4341810374424 |
| 16 | 43852571179147329 |
| 17 | 5999233370012268208703 |
| 18 | 22578209776617142730549141113 |
| 19 | 5759108920458153526111129552362859699 |