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 | -29 |
| 2 | 348 |
| 3 | -2059 |
| 4 | 4234 |
| 5 | 19024 |
| 6 | -133545 |
| 7 | 168954 |
| 8 | 832532 |
| 9 | -2499510 |
| 10 | -2308545 |
| 11 | 11279782 |
| 12 | 22571454 |
| 13 | -55885088 |
| 14 | -217574356 |
| 15 | 383141127 |
| 16 | 1062928416 |
| 17 | -961984578 |
| 18 | -4860016156 |
| 19 | -3840850828 |
| 20 | 23405599444 |