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 | 1 |
| 2 | 5 |
| 3 | 43 |
| 4 | 473 |
| 5 | 5942 |
| 6 | 81393 |
| 7 | 1186342 |
| 8 | 18132473 |
| 9 | 287948903 |
| 10 | 4722077279 |
| 11 | 79636530163 |
| 12 | 1377304530677 |
| 13 | 24382127678100 |
| 14 | 441294262119031 |
| 15 | 8160739579770316 |
| 16 | 154169018332135841 |
| 17 | 2975846752734820345 |
| 18 | 58718914018159811186 |