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 | -3 |
| 2 | -3 |
| 3 | 115 |
| 4 | 2915 |
| 5 | 64233 |
| 6 | 1481705 |
| 7 | 37052343 |
| 8 | 1010794167 |
| 9 | 30033906085 |
| 10 | 968116541861 |
| 11 | 33698668291755 |
| 12 | 1260923220465323 |
| 13 | 50500621166196705 |
| 14 | 2156396364937639905 |
| 15 | 97820098649121183487 |
| 16 | 4698747050422172145407 |