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 | 3 |
| 5 | 26 |
| 6 | 474 |
| 7 | 17214 |
| 8 | 1371454 |
| 9 | 231924780 |
| 10 | 82367152914 |
| 11 | 61718801166402 |
| 12 | 97482824713311442 |
| 13 | 323896536556067453466 |
| 14 | 2262929852279448821099932 |
| 15 | 33231590982432936619392054662 |
| 16 | 1025257090790362187626154669771934 |
| 17 | 66429726878393651076826663971376589034 |