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 | 5 |
| 3 | 5 |
| 4 | -43 |
| 5 | -27 |
| 6 | 597 |
| 7 | 805 |
| 8 | -11883 |
| 9 | -40475 |
| 10 | 265685 |
| 11 | 2133157 |
| 12 | -3405803 |
| 13 | -107760283 |
| 14 | -301542315 |
| 15 | 4458255397 |
| 16 | 42421260949 |
| 17 | -45046794011 |
| 18 | -3365690666283 |
| 19 | -19844416105563 |
| 20 | 138274174035221 |
| 21 | 2917746747446373 |
| 22 | 11092963732101461 |
| 23 | -207438902364296411 |
| 24 | -3205301465165742187 |