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 | 4 |
| 4 | 10 |
| 5 | 27 |
| 6 | 83 |
| 7 | 277 |
| 8 | 1015 |
| 9 | 4007 |
| 10 | 17047 |
| 11 | 77451 |
| 12 | 374889 |
| 13 | 1923168 |
| 14 | 10427250 |
| 15 | 59544957 |
| 16 | 357236992 |
| 17 | 2245822801 |
| 18 | 14762969601 |
| 19 | 101264286082 |
| 20 | 723499803180 |
| 21 | 5375063821727 |
| 22 | 41459660565329 |
| 23 | 331546282841906 |
| 24 | 2745163969235517 |
| 25 | 23505333233440927 |
| 26 | 207895424692608432 |