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 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 6 |
| 8 | 13 |
| 9 | 27 |
| 10 | 58 |
| 11 | 128 |
| 12 | 286 |
| 13 | 640 |
| 14 | 1452 |
| 15 | 3308 |
| 16 | 7594 |
| 17 | 17512 |
| 18 | 40591 |
| 19 | 94449 |
| 20 | 220672 |