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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 7 |
| 9 | 35 |
| 10 | 119 |
| 11 | 329 |
| 12 | 791 |
| 13 | 1715 |
| 14 | 3431 |
| 15 | 45031 |
| 16 | 400281 |
| 17 | 2313633 |
| 18 | 10467037 |
| 19 | 39845281 |
| 20 | 132908041 |
| 21 | 398840401 |
| 22 | 7677528495 |
| 23 | 98103087719 |
| 24 | 800524248391 |
| 25 | 5030038213949 |
| 26 | 26202586666879 |
| 27 | 117991927960739 |
| 28 | 472105349529479 |
| 29 | 11979440405949527 |