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 | 7 |
| 5 | 1 |
| 6 | 2790 |
| 7 | 1 |
| 8 | 216027 |
| 9 | 3025 |
| 10 | 21730275 |
| 11 | 1 |
| 12 | 143362465643243568744 |
| 13 | 1 |
| 14 | 404056132480 |
| 15 | 500592722458920 |
| 16 | 12056706465173227408551 |
| 17 | 1 |
| 18 | 99260615209905051640711424376160950 |
| 19 | 1 |
| 20 | 105138504356810366747790360523498652392500 |
| 21 | 143413971571112402506500 |
| 22 | 768149712982621155186 |