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 | -120 |
| 2 | 1764 |
| 3 | -13132 |
| 4 | 67284 |
| 5 | -269325 |
| 6 | 902055 |
| 7 | -2637558 |
| 8 | 6926634 |
| 9 | -16669653 |
| 10 | 37312275 |
| 11 | -78558480 |
| 12 | 156952432 |
| 13 | -299650806 |
| 14 | 549789282 |
| 15 | -973941900 |
| 16 | 1672280820 |
| 17 | -2792167686 |
| 18 | 4546047198 |
| 19 | -7234669596 |
| 20 | 11276842500 |
| 21 | -17247104875 |
| 22 | 25922927745 |
| 23 | -38343278610 |
| 24 | 55880640270 |