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 | 0 |
| 1 | 5 |
| 2 | 27 |
| 3 | 753 |
| 4 | 11401 |
| 5 | 26042 |
| 6 | 1475501 |
| 7 | 17419550 |
| 8 | 95368234 |
| 9 | 738444877 |
| 10 | 21959974096 |
| 11 | 73834823298 |
| 12 | 2356328188186 |
| 13 | 11771613318349 |
| 14 | 149862461894073 |
| 15 | 3567610964143242 |
| 16 | 7744859133558893 |
| 17 | 421292427905708342 |
| 18 | 1937633513403589655 |