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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 1 |
| 6 | 7 |
| 7 | 1 |
| 8 | 48 |
| 9 | 50 |
| 10 | 796 |
| 11 | 777 |
| 12 | 24823 |
| 13 | 9315 |
| 14 | 1501873 |
| 15 | 2585314 |
| 16 | 200614419 |
| 17 | 382810931 |
| 18 | 52597087873 |
| 19 | 48712723680 |
| 20 | 27115688491527 |