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 | 2 |
| 5 | 1 |
| 6 | 1 |
| 7 | 9 |
| 8 | 9 |
| 9 | 1 |
| 10 | 1 |
| 11 | 730 |
| 12 | 1458 |
| 13 | 730 |
| 14 | 1 |
| 15 | 1 |
| 16 | 389017001 |
| 17 | 3488380912 |
| 18 | 3488380912 |
| 19 | 389017001 |
| 20 | 1 |
| 21 | 1 |
| 22 | 58871587162270593034051002 |
| 23 | 42508286068210633669596761529 |
| 24 | 84898828962096726153125421056 |
| 25 | 42508286068210633669596761529 |
| 26 | 58871587162270593034051002 |
| 27 | 1 |