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 | 4 |
| 3 | 257 |
| 4 | 4286 |
| 5 | 258952 |
| 6 | 11816512 |
| 7 | 632854273 |
| 8 | 43732565914 |
| 9 | 2637804065366 |
| 10 | 207379028199080 |
| 11 | 14568483339859880 |
| 12 | 1205457271871693920 |
| 13 | 95108827011788280160 |
| 14 | 8187664948710535579904 |
| 15 | 698818327346476962092801 |
| 16 | 62477582066507173352034866 |
| 17 | 5627626080883126186936773514 |