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 | 3 |
| 5 | 4 |
| 6 | 11 |
| 7 | 23 |
| 8 | 62 |
| 9 | 149 |
| 10 | 409 |
| 11 | 1066 |
| 12 | 2931 |
| 13 | 7981 |
| 14 | 22166 |
| 15 | 61508 |
| 16 | 172267 |
| 17 | 483088 |
| 18 | 1361475 |
| 19 | 3845139 |
| 20 | 10894630 |