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 | 4 |
| 2 | 22 |
| 3 | 139 |
| 4 | 779 |
| 5 | 3455 |
| 6 | 12507 |
| 7 | 37303 |
| 8 | 92968 |
| 9 | 195963 |
| 10 | 352433 |
| 11 | 544382 |
| 12 | 725612 |
| 13 | 837184 |
| 14 | 837184 |
| 15 | 725612 |
| 16 | 544382 |
| 17 | 352433 |
| 18 | 195963 |
| 19 | 92968 |
| 20 | 37303 |
| 21 | 12507 |
| 22 | 3455 |
| 23 | 779 |
| 24 | 139 |
| 25 | 22 |
| 26 | 4 |
| 27 | 1 |