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 | 4 |
| 2 | 7 |
| 3 | 17 |
| 4 | 59 |
| 5 | 277 |
| 6 | 1787 |
| 7 | 15299 |
| 8 | 167449 |
| 9 | 2269733 |
| 10 | 37139213 |
| 11 | 718064159 |
| 12 | 16123689073 |
| 13 | 414507281407 |
| 14 | 12055296811267 |
| 15 | 392654585611999 |
| 16 | 14199419938376521 |
| 17 | 565855918431234443 |