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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 24 |
| 5 | 1 |
| 6 | 1 |
| 7 | 553 |
| 8 | 553 |
| 9 | 1 |
| 10 | 1 |
| 11 | 12720 |
| 12 | 293090 |
| 13 | 12720 |
| 14 | 1 |
| 15 | 1 |
| 16 | 292561 |
| 17 | 155057330 |
| 18 | 155057330 |
| 19 | 292561 |
| 20 | 1 |
| 21 | 1 |
| 22 | 6728904 |
| 23 | 82025620131 |
| 24 | 1886737591440 |
| 25 | 82025620131 |
| 26 | 6728904 |
| 27 | 1 |
| 28 | 1 |
| 29 | 154764793 |
| 30 | 43391559778203 |
| 31 | 22956018300670611 |