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 | 3 |
| 2 | 12 |
| 3 | 76 |
| 4 | 711 |
| 5 | 9054 |
| 6 | 147471 |
| 7 | 2938176 |
| 8 | 69328365 |
| 9 | 1891371807 |
| 10 | 58575539361 |
| 11 | 2030011517685 |
| 12 | 77827890696820 |
| 13 | 3270046577551695 |
| 14 | 149407542447596319 |
| 15 | 7374639622066056408 |
| 16 | 391044078030333899385 |
| 17 | 22168014954558449549349 |