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 | 3 |
| 4 | 10 |
| 5 | 39 |
| 6 | 160 |
| 7 | 691 |
| 8 | 3081 |
| 9 | 14095 |
| 10 | 65757 |
| 11 | 311695 |
| 12 | 1496833 |
| 13 | 7266979 |
| 14 | 35608419 |
| 15 | 175875537 |
| 16 | 874698246 |
| 17 | 4376646808 |
| 18 | 22016578909 |
| 19 | 111282845162 |
| 20 | 564886771380 |
| 21 | 2878498888625 |
| 22 | 14719219809915 |
| 23 | 75505990358779 |
| 24 | 388451973679785 |