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 | 3 |
| 1 | 12 |
| 2 | 62 |
| 3 | 378 |
| 4 | 2498 |
| 5 | 17082 |
| 6 | 118442 |
| 7 | 825858 |
| 8 | 5771618 |
| 9 | 40373802 |
| 10 | 282535322 |
| 11 | 1977505938 |
| 12 | 13841822738 |
| 13 | 96890612922 |
| 14 | 678227872202 |
| 15 | 4747575891618 |
| 16 | 33232973681858 |
| 17 | 232630643258442 |
| 18 | 1628413985593082 |
| 19 | 11398896348158898 |