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 | 1 |
| 2 | 1 |
| 3 | 11 |
| 4 | 151 |
| 5 | 15619 |
| 6 | 655177 |
| 7 | 27085381 |
| 8 | 2330931341 |
| 9 | 12157712239 |
| 10 | 37307713155613 |
| 11 | 339781108897078469 |
| 12 | 75489558096433522049 |
| 13 | 11482547005345338463969 |
| 14 | 3607856726470666022715979 |
| 15 | 18497593486903125823791655511 |
| 16 | 520679973964725199436393399689 |