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 | 2 |
| 3 | 3 |
| 4 | -3 |
| 5 | -50 |
| 6 | -244 |
| 7 | -714 |
| 8 | -530 |
| 9 | 8522 |
| 10 | 63548 |
| 11 | 259473 |
| 12 | 535647 |
| 13 | -1321437 |
| 14 | -19094684 |
| 15 | -103022071 |
| 16 | -322370363 |
| 17 | -142186810 |
| 18 | 5537336460 |
| 19 | 41081448638 |
| 20 | 170484444654 |
| 21 | 332739198585 |
| 22 | -1241023311708 |
| 23 | -15677607031084 |
| 24 | -83737193010368 |
| 25 | -255608722098225 |
| 26 | -12706843586158 |