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 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 1 |
| 4 | 94 |
| 5 | 122 |
| 6 | 2372 |
| 7 | 173 |
| 8 | 50294 |
| 9 | 56014 |
| 10 | 983740 |
| 11 | 266930 |
| 12 | 18376812 |
| 13 | 19624884 |
| 14 | 333313544 |
| 15 | 5500541 |
| 16 | 5923399334 |
| 17 | 6206260694 |
| 18 | 103708093964 |
| 19 | 27001710566 |
| 20 | 1795265477444 |
| 21 | 1860906681644 |
| 22 | 30802090121144 |
| 23 | 1988024895074 |
| 24 | 524715115366844 |
| 25 | 540193965134732 |
| 26 | 8886200762228312 |