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 | 3 |
| 3 | 21 |
| 4 | 357 |
| 5 | 14637 |
| 6 | 1449063 |
| 7 | 346326057 |
| 8 | 199830134889 |
| 9 | 278363377900377 |
| 10 | 936136039878967851 |
| 11 | 7600488507777339982269 |
| 12 | 148977175240943640992454669 |
| 13 | 7049748909576694035403947391749 |
| 14 | 805384464676770256686653161875581007 |