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 | -3 |
| 2 | 23 |
| 3 | -15 |
| 4 | 247 |
| 5 | 5 |
| 6 | 473 |
| 7 | -455 |
| 8 | 607 |
| 9 | 12429 |
| 10 | -1235 |
| 11 | -555775 |
| 12 | 1479997 |
| 13 | 35135893 |
| 14 | -57169 |
| 15 | -2990414775 |
| 16 | 118534559 |
| 17 | 329655706397 |
| 18 | -5749662829 |
| 19 | -45692713833455 |
| 20 | 91546290557 |
| 21 | 7777794952987941 |
| 22 | -1792042786391 |
| 23 | -1595024111042171815 |
| 24 | 1982765468442277 |