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 | 1 |
| 2 | -5 |
| 3 | 259 |
| 4 | -3229 |
| 5 | 117469 |
| 6 | -7156487 |
| 7 | 2430898831 |
| 8 | -60997921 |
| 9 | 141433003757 |
| 10 | -25587296781661 |
| 11 | 51270597630767 |
| 12 | -6791120985104747 |
| 13 | 3400039831130408821 |
| 14 | -15317460638921852507 |
| 15 | 25789165074168004597399 |
| 16 | -1550286106708510672406629 |
| 17 | 24823277118070193095631689 |