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 | -21 |
| 3 | 71 |
| 4 | 2541 |
| 5 | -14641 |
| 6 | -771561 |
| 7 | 6242711 |
| 8 | 437721081 |
| 9 | -4555133281 |
| 10 | -399147115101 |
| 11 | 5076970085351 |
| 12 | 533834157267621 |
| 13 | -8024733763147921 |
| 14 | -984414289344742641 |
| 15 | 17074591123571719991 |
| 16 | 2393808447230495554161 |
| 17 | -47056485265721520250561 |