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 | 6 |
| 3 | 23 |
| 4 | 98 |
| 5 | 437 |
| 6 | 1995 |
| 7 | 9242 |
| 8 | 43258 |
| 9 | 204053 |
| 10 | 968441 |
| 11 | 4619012 |
| 12 | 22120631 |
| 13 | 106300508 |
| 14 | 512321438 |
| 15 | 2475395303 |
| 16 | 11986728458 |
| 17 | 58156146653 |
| 18 | 282640193313 |
| 19 | 1375737276788 |
| 20 | 6705522150973 |
| 21 | 32724071280518 |
| 22 | 159878425878848 |