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 | -5 |
| 2 | 59 |
| 3 | -45 |
| 4 | -833 |
| 5 | 555 |
| 6 | 91949 |
| 7 | -39165 |
| 8 | -5905553 |
| 9 | 4525659 |
| 10 | 1896207145 |
| 11 | -805349325 |
| 12 | -16784375150843 |
| 13 | 203564524683 |
| 14 | 10883940836363 |
| 15 | -69292329479325 |
| 16 | -359945426667938881 |
| 17 | 30553447357629627 |
| 18 | 279390122477675004263 |
| 19 | -16939595863125337965 |