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 | 1 |
| 2 | 1 |
| 3 | -11 |
| 4 | 156 |
| 5 | -627 |
| 6 | 736 |
| 7 | 591 |
| 8 | -1116 |
| 9 | -369 |
| 10 | -6 |
| 11 | 106 |
| 12 | -2772 |
| 13 | 76070 |
| 14 | -1087552 |
| 15 | 8632650 |
| 16 | -40358780 |
| 17 | 106452214 |
| 18 | -99774996 |
| 19 | -284430514 |
| 20 | 1125952500 |
| 21 | -1581820542 |
| 22 | 737716032 |
| 23 | 414532350 |
| 24 | -357790500 |
| 25 | -81870750 |
| 26 | -1275750 |