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 | -6 |
| 4 | 6 |
| 5 | 5 |
| 6 | 40 |
| 7 | 11 |
| 8 | 226 |
| 9 | -516 |
| 10 | -186 |
| 11 | -844 |
| 12 | 3731 |
| 13 | -3734 |
| 14 | 814 |
| 15 | -33819 |
| 16 | 85660 |
| 17 | -46022 |
| 18 | 210342 |
| 19 | -411678 |
| 20 | 593996 |
| 21 | -2980156 |
| 22 | 2076721 |
| 23 | -3445584 |
| 24 | 40785410 |
| 25 | -37503158 |
| 26 | 98085 |
| 27 | -271846888 |
| 28 | 336918770 |
| 29 | -295108832 |
| 30 | 2178341296 |
| 31 | -2404059340 |
| 32 | 6127604258 |