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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 3 |
| 5 | -4 |
| 6 | 1 |
| 7 | -21 |
| 8 | 31 |
| 9 | -11 |
| 10 | 1 |
| 11 | 315 |
| 12 | -486 |
| 13 | 196 |
| 14 | -26 |
| 15 | 1 |
| 16 | -9765 |
| 17 | 15381 |
| 18 | -6562 |
| 19 | 1002 |
| 20 | -57 |
| 21 | 1 |
| 22 | 615195 |
| 23 | -978768 |
| 24 | 428787 |
| 25 | -69688 |
| 26 | 4593 |
| 27 | -120 |
| 28 | 1 |
| 29 | -78129765 |
| 30 | 124918731 |
| 31 | -55434717 |
| 32 | 9279163 |
| 33 | -652999 |
| 34 | 19833 |
| 35 | -247 |
| 36 | 1 |