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 | 2 |
| 2 | 0 |
| 3 | -6 |
| 4 | -1 |
| 5 | 50 |
| 6 | 14 |
| 7 | -854 |
| 8 | -323 |
| 9 | 24930 |
| 10 | 11804 |
| 11 | -1111462 |
| 12 | -631621 |
| 13 | 70271890 |
| 14 | 46590634 |
| 15 | -5980829430 |
| 16 | -4531805575 |
| 17 | 659311412930 |
| 18 | 562021682744 |
| 19 | -91385427666758 |
| 20 | -86555950096265 |
| 21 | 15555589905976050 |
| 22 | 16206870089730374 |
| 23 | -3190048222084343446 |
| 24 | -3625755168948973771 |