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 | 5 |
| 1 | 26 |
| 2 | 265 |
| 3 | 1351 |
| 4 | 13775 |
| 5 | 70226 |
| 6 | 716035 |
| 7 | 3650401 |
| 8 | 37220045 |
| 9 | 189750626 |
| 10 | 1934726305 |
| 11 | 9863382151 |
| 12 | 100568547815 |
| 13 | 512706121226 |
| 14 | 5227629760075 |
| 15 | 26650854921601 |
| 16 | 271736178976085 |
| 17 | 1385331749802026 |
| 18 | 14125053676996345 |