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 | -97 |
| 4 | -2063 |
| 5 | -53409 |
| 6 | -752343 |
| 7 | 166831871 |
| 8 | 43685848289 |
| 9 | 9398558916159 |
| 10 | 2116926930779225 |
| 11 | 524586454143030495 |
| 12 | 144620290378876829905 |
| 13 | 44287070229737735633567 |
| 14 | 14954349885478653319004041 |