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 | 2 |
| 4 | 6 |
| 5 | 6 |
| 6 | 14 |
| 7 | 25 |
| 8 | 60 |
| 9 | 124 |
| 10 | 302 |
| 11 | 696 |
| 12 | 1745 |
| 13 | 4300 |
| 14 | 11042 |
| 15 | 28362 |
| 16 | 74483 |
| 17 | 196539 |
| 18 | 525521 |
| 19 | 1413635 |
| 20 | 3835932 |
| 21 | 10468384 |