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) |
|---|---|
| 1 | 5 |
| 2 | -1 |
| 3 | 65 |
| 4 | -1381 |
| 5 | 50525 |
| 6 | -2702761 |
| 7 | 199360985 |
| 8 | -19391512141 |
| 9 | 2404879675445 |
| 10 | -370371188237521 |
| 11 | 69348874393137905 |
| 12 | -15514534163557086901 |
| 13 | 4087072509293123892365 |
| 14 | -1252259641403629865468281 |
| 15 | 441543893249023104553682825 |
| 16 | -177519391579539289436664789661 |