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 | -23 |
| 8 | 33 |
| 9 | -11 |
| 10 | 1 |
| 11 | 425 |
| 12 | -620 |
| 13 | 220 |
| 14 | -26 |
| 15 | 1 |
| 16 | -18129 |
| 17 | 26525 |
| 18 | -9520 |
| 19 | 1180 |
| 20 | -57 |
| 21 | 1 |
| 22 | 1721419 |
| 23 | -2519664 |
| 24 | 905765 |
| 25 | -113050 |
| 26 | 5649 |
| 27 | -120 |
| 28 | 1 |
| 29 | -353654167 |
| 30 | 517670461 |
| 31 | -186123259 |
| 32 | 23248085 |
| 33 | -1166221 |
| 34 | 25347 |
| 35 | -247 |
| 36 | 1 |
| 37 | 153923102577 |