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 | 1 |
| 1 | 11 |
| 2 | 71 |
| 3 | 539 |
| 4 | 4271 |
| 5 | 34276 |
| 6 | 276119 |
| 7 | 2226851 |
| 8 | 17965151 |
| 9 | 144948419 |
| 10 | 1169523076 |
| 11 | 9436433171 |
| 12 | 76139155439 |
| 13 | 614339685971 |
| 14 | 4956888901511 |
| 15 | 39995380044004 |
| 16 | 322708555336511 |
| 17 | 2603821045832171 |
| 18 | 21009309912323639 |