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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 9 |
| 6 | 39 |
| 7 | 66 |
| 8 | 318 |
| 9 | 627 |
| 10 | 3213 |
| 11 | 7182 |
| 12 | 38898 |
| 13 | 96237 |
| 14 | 548883 |
| 15 | 1478142 |
| 16 | 8843778 |
| 17 | 25615647 |
| 18 | 160178913 |
| 19 | 494550162 |
| 20 | 3221341038 |
| 21 | 10527969537 |
| 22 | 71221636863 |
| 23 | 245012506362 |
| 24 | 1716978047238 |
| 25 | 6188875533387 |
| 26 | 44822878860213 |
| 27 | 168635167816662 |
| 28 | 1259693955204138 |