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 | 0 |
| 3 | 21 |
| 4 | 24 |
| 5 | 293 |
| 6 | 7 |
| 7 | 5452 |
| 8 | 6637 |
| 9 | 74664 |
| 10 | 6458 |
| 11 | 1384558 |
| 12 | 1578150 |
| 13 | 19209993 |
| 14 | 474240 |
| 15 | 357331029 |
| 16 | 434949016 |
| 17 | 4893636133 |
| 18 | 421910023 |
| 19 | 90731484851 |
| 20 | 103435736251 |
| 21 | 1258858815339 |
| 22 | 30658739531 |
| 23 | 23416607110667 |
| 24 | 28506443273867 |