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 | -3 |
| 3 | 1 |
| 4 | 90 |
| 5 | 5 |
| 6 | -1 |
| 7 | -2205 |
| 8 | -3675 |
| 9 | -7 |
| 10 | 1 |
| 11 | 46116 |
| 12 | 532350 |
| 13 | 107604 |
| 14 | 9 |
| 15 | -1 |
| 16 | -812295 |
| 17 | -52887450 |
| 18 | -74042430 |
| 19 | -2436885 |
| 20 | -11 |
| 21 | 1 |
| 22 | 12666654 |
| 23 | 4257556875 |
| 24 | 24609789204 |
| 25 | 7663602375 |
| 26 | 46444398 |
| 27 | 13 |
| 28 | -1 |
| 29 | -181355265 |
| 30 | -292686719325 |
| 31 | -5841878527485 |
| 32 | -7510986678195 |
| 33 | -643910782515 |
| 34 | -785872815 |
| 35 | -15 |