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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | -3 |
| 6 | -26 |
| 7 | 200 |
| 8 | 2154 |
| 9 | 11484 |
| 10 | 19600 |
| 11 | -477397 |
| 12 | -8219901 |
| 13 | -91253055 |
| 14 | -827443165 |
| 15 | -6390673975 |
| 16 | -40675147794 |
| 17 | -175537475858 |
| 18 | 224340865430 |
| 19 | 16557635792557 |
| 20 | 240512852610684 |
| 21 | 2400398259375610 |
| 22 | 16146663225893061 |
| 23 | 5309635516930146 |
| 24 | -2257043208658957597 |
| 25 | -52738581235904454897 |