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 | 3 |
| 5 | 6 |
| 6 | 12 |
| 7 | 27 |
| 8 | 63 |
| 9 | 154 |
| 10 | 398 |
| 11 | 1055 |
| 12 | 2970 |
| 13 | 8503 |
| 14 | 25651 |
| 15 | 78483 |
| 16 | 250487 |
| 17 | 811802 |
| 18 | 2723130 |
| 19 | 9295483 |
| 20 | 32653552 |
| 21 | 116866283 |
| 22 | 428464743 |
| 23 | 1600474365 |
| 24 | 6102119282 |
| 25 | 23690388631 |
| 26 | 93631999867 |
| 27 | 376561553417 |
| 28 | 1538997717423 |
| 29 | 6395852269479 |
| 30 | 26978392034357 |
| 31 | 115628083386280 |
| 32 | 502520979828775 |