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 | 2 |
| 5 | 4 |
| 6 | 10 |
| 7 | 20 |
| 8 | 48 |
| 9 | 108 |
| 10 | 255 |
| 11 | 595 |
| 12 | 1435 |
| 13 | 3434 |
| 14 | 8372 |
| 15 | 20419 |
| 16 | 50289 |
| 17 | 124289 |
| 18 | 309122 |
| 19 | 771508 |
| 20 | 1934462 |