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) |
|---|---|
| 2 | 1 |
| 3 | 5 |
| 4 | -21 |
| 5 | 33 |
| 6 | -65 |
| 7 | 85 |
| 8 | -133 |
| 9 | 161 |
| 10 | 261 |
| 11 | -341 |
| 12 | -481 |
| 13 | 533 |
| 14 | -645 |
| 15 | 705 |
| 16 | 901 |
| 17 | -12803 |
| 18 | -1281 |
| 19 | -1541 |
| 20 | 1633 |
| 21 | -1825 |
| 22 | -14615 |
| 23 | -11537 |
| 24 | 2581 |
| 25 | -3201 |
| 26 | 3333 |