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 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 29 |
| 6 | 61 |
| 7 | 256 |
| 8 | 596 |
| 9 | 2507 |
| 10 | 6247 |
| 11 | 26197 |
| 12 | 68652 |
| 13 | 286232 |
| 14 | 780508 |
| 15 | 3231060 |
| 16 | 9102590 |
| 17 | 37392935 |
| 18 | 108279767 |
| 19 | 441342883 |
| 20 | 1308552478 |
| 21 | 5292781266 |
| 22 | 16018989626 |
| 23 | 64315663716 |
| 24 | 198213843417 |
| 25 | 790252270626 |
| 26 | 2474924176566 |
| 27 | 9802205324516 |
| 28 | 31142246753638 |