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 | -31 |
| 2 | 434 |
| 3 | -3565 |
| 4 | 18445 |
| 5 | -57505 |
| 6 | 70091 |
| 7 | 227447 |
| 8 | -1241550 |
| 9 | 2102730 |
| 10 | 1139498 |
| 11 | -11000164 |
| 12 | 15185009 |
| 13 | 8060465 |
| 14 | -39266925 |
| 15 | 11975548 |
| 16 | 33735905 |
| 17 | 79961555 |
| 18 | -212042635 |
| 19 | -176681400 |
| 20 | 762467041 |
| 21 | -231771190 |
| 22 | -762218948 |
| 23 | -59474275 |
| 24 | 687626655 |
| 25 | 2193123086 |
| 26 | -3317871844 |