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 | -7 |
| 3 | -241 |
| 4 | -4495 |
| 5 | -652801 |
| 6 | -15004375 |
| 7 | -7047990769 |
| 8 | 1597056262625 |
| 9 | -360304327144321 |
| 10 | 286464442762907225 |
| 11 | 560117092794518159 |
| 12 | 78257061390674957994065 |
| 13 | 5684812583023438995911039 |
| 14 | 45666128878264725133259682185 |