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 | 2 |
| 1 | 7 |
| 2 | 41 |
| 3 | 312 |
| 4 | 2784 |
| 5 | 27917 |
| 6 | 307943 |
| 7 | 3690055 |
| 8 | 47635777 |
| 9 | 658405747 |
| 10 | 9695617821 |
| 11 | 151488900012 |
| 12 | 2502346785164 |
| 13 | 43560247035581 |
| 14 | 796828655891895 |
| 15 | 15277217956632472 |
| 16 | 306268455537216444 |
| 17 | 6406216616616309707 |
| 18 | 139535240869213561821 |
| 19 | 3159084189417388736206 |