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 | 15 |
| 2 | 877 |
| 3 | 115975 |
| 4 | 27644437 |
| 5 | 10480142147 |
| 6 | 5832742205057 |
| 7 | 4506715738447323 |
| 8 | 4638590332229999353 |
| 9 | 6160539404599934652455 |
| 10 | 10293358946226376485095653 |
| 11 | 21195039388640360462388656799 |
| 12 | 52868366208550447901945575624941 |
| 13 | 157450588391204931289324344702531067 |