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 | -5 |
| 3 | -41 |
| 4 | -125 |
| 5 | 131 |
| 6 | 3301 |
| 7 | 15625 |
| 8 | 16115 |
| 9 | -254525 |
| 10 | -1813055 |
| 11 | -4617755 |
| 12 | 14903725 |
| 13 | 192390589 |
| 14 | 767919595 |
| 15 | -28588201 |
| 16 | -18144634861 |
| 17 | -105011253485 |
| 18 | -184605603311 |
| 19 | 1406589226405 |
| 20 | 12610893954745 |
| 21 | 40402054036345 |
| 22 | -63847551719825 |
| 23 | -1340432504352485 |
| 24 | -6346702151685475 |