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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 9 |
| 6 | 17 |
| 7 | 55 |
| 8 | 122 |
| 9 | 289 |
| 10 | 828 |
| 11 | 2037 |
| 12 | 5239 |
| 13 | 14578 |
| 14 | 37942 |
| 15 | 101307 |
| 16 | 281041 |
| 17 | 755726 |
| 18 | 2062288 |