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 | 5 |
| 2 | 41 |
| 3 | 317 |
| 4 | 2321 |
| 5 | 16565 |
| 6 | 116921 |
| 7 | 821357 |
| 8 | 5758241 |
| 9 | 40333925 |
| 10 | 282416201 |
| 11 | 1977149597 |
| 12 | 13840755761 |
| 13 | 96887416085 |
| 14 | 678218289881 |
| 15 | 4747547161037 |
| 16 | 33232887522881 |
| 17 | 232630384847045 |
| 18 | 1628413210489961 |
| 19 | 11398894023111677 |