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 | -7 |
| 3 | -23 |
| 4 | 17 |
| 5 | 241 |
| 6 | 329 |
| 7 | -1511 |
| 8 | -5983 |
| 9 | 1633 |
| 10 | 57113 |
| 11 | 99529 |
| 12 | -314959 |
| 13 | -1525679 |
| 14 | -216727 |
| 15 | 13297657 |
| 16 | 28545857 |
| 17 | -62587199 |
| 18 | -382087111 |
| 19 | -200889431 |
| 20 | 3037005137 |
| 21 | 7882015153 |
| 22 | -11569015927 |
| 23 | -94076168231 |
| 24 | -84031193119 |
| 25 | 678623127841 |
| 26 | 2113526993753 |