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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | -2 |
| 4 | 5 |
| 5 | 3 |
| 6 | -88 |
| 7 | 362 |
| 8 | 534 |
| 9 | -17363 |
| 10 | 103354 |
| 11 | 175690 |
| 12 | -9218328 |
| 13 | 80446715 |
| 14 | 46936658 |
| 15 | -10553663682 |
| 16 | 136009808336 |
| 17 | -210505566343 |
| 18 | -22766371152222 |
| 19 | 418488315816586 |
| 20 | -1679396876267976 |
| 21 | -82907733267235305 |
| 22 | 2070045795782097506 |
| 23 | -13611715282931011890 |
| 24 | -463120892871268874832 |