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 | 2 |
| 2 | 22 |
| 3 | 314 |
| 4 | 5326 |
| 5 | 102722 |
| 6 | 2197558 |
| 7 | 51355514 |
| 8 | 1297759918 |
| 9 | 35208930050 |
| 10 | 1020115715542 |
| 11 | 31432396066106 |
| 12 | 1026506419425550 |
| 13 | 35428218801977666 |
| 14 | 1288967076156307702 |
| 15 | 49323199246104202874 |
| 16 | 1980947315202528449518 |
| 17 | 83342865788161594337282 |
| 18 | 3666525676611059535630742 |