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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 24 |
| 5 | 176 |
| 6 | 2623 |
| 7 | 79479 |
| 8 | 5141566 |
| 9 | 669156932 |
| 10 | 178757299486 |
| 11 | 104033138190939 |
| 12 | 125893536876304530 |
| 13 | 320091464865316176891 |
| 14 | 1828276720220263211454403 |
| 15 | 22393381352339181425954204921 |
| 16 | 582288411818399885839904060337943 |
| 17 | 34678571156322738984042119670750665153 |