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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 10 |
| 7 | 223 |
| 8 | 144 |
| 9 | -9998 |
| 10 | -58280 |
| 11 | 348134 |
| 12 | 9517942 |
| 13 | 92182430 |
| 14 | 404027415 |
| 15 | -2717447318 |
| 16 | -79612186200 |
| 17 | -983858494247 |
| 18 | -7964818545554 |
| 19 | -31776540093807 |
| 20 | 289145607666924 |
| 21 | 8243854930562789 |
| 22 | 108476952917770938 |
| 23 | 885519807642948390 |
| 24 | 715407405727600672 |
| 25 | -147909423143942345447 |