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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 27 |
| 5 | 122 |
| 6 | 607 |
| 7 | 3208 |
| 8 | 17688 |
| 9 | 99803 |
| 10 | 571238 |
| 11 | 3292738 |
| 12 | 19001315 |
| 13 | 109303307 |
| 14 | 624615928 |
| 15 | 3537913240 |
| 16 | 19843769848 |
| 17 | 110273489737 |
| 18 | 608712132055 |
| 19 | 3355449334452 |
| 20 | 18624818099047 |
| 21 | 105191779542849 |
| 22 | 610586100129734 |
| 23 | 3662333209225714 |
| 24 | 22652502251884322 |