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 | 0 |
| 1 | 1 |
| 2 | -4 |
| 3 | 19 |
| 4 | -125 |
| 5 | 1083 |
| 6 | -11669 |
| 7 | 150512 |
| 8 | -2262546 |
| 9 | 38851957 |
| 10 | -750394759 |
| 11 | 16102118954 |
| 12 | -380058372572 |
| 13 | 9785829784651 |
| 14 | -272962664838317 |
| 15 | 8199582838569366 |
| 16 | -263901999580713904 |
| 17 | 9059869807873906105 |