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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 29 |
| 6 | 29 |
| 7 | 93 |
| 8 | 221 |
| 9 | 221 |
| 10 | 733 |
| 11 | 1757 |
| 12 | 3805 |
| 13 | 7901 |
| 14 | 7901 |
| 15 | 24285 |
| 16 | 57053 |
| 17 | 122589 |
| 18 | 122589 |
| 19 | 384733 |
| 20 | 384733 |
| 21 | 384733 |
| 22 | 2481885 |
| 23 | 2481885 |
| 24 | 10870493 |
| 25 | 10870493 |
| 26 | 10870493 |
| 27 | 10870493 |
| 28 | 145088221 |