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 | -26 |
| 2 | 273 |
| 3 | -1326 |
| 4 | 1274 |
| 5 | 16900 |
| 6 | -70369 |
| 7 | 4498 |
| 8 | 520884 |
| 9 | -574470 |
| 10 | -2159898 |
| 11 | 712062 |
| 12 | 16058549 |
| 13 | 6811374 |
| 14 | -109730712 |
| 15 | -34094866 |
| 16 | 371654686 |
| 17 | 547508416 |
| 18 | -667428372 |
| 19 | -4233187348 |
| 20 | -477050379 |
| 21 | 12477952396 |
| 22 | 24147501092 |