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 | 13 |
| 5 | 2 |
| 6 | 1 |
| 7 | 218 |
| 8 | 208 |
| 9 | 78 |
| 10 | 6 |
| 11 | 1 |
| 12 | 1 |
| 13 | 11506 |
| 14 | 21172 |
| 15 | 20262 |
| 16 | 9560 |
| 17 | 2593 |
| 18 | 408 |
| 19 | 32 |
| 20 | 2 |