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 | -1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | -1 |
| 6 | -4 |
| 7 | -4 |
| 8 | 3 |
| 9 | 10 |
| 10 | 7 |
| 11 | -6 |
| 12 | -20 |
| 13 | -18 |
| 14 | 12 |
| 15 | 47 |
| 16 | 39 |
| 17 | -27 |
| 18 | -100 |
| 19 | -89 |
| 20 | 53 |
| 21 | 224 |
| 22 | 202 |
| 23 | -115 |
| 24 | -490 |
| 25 | -453 |
| 26 | 232 |
| 27 | 1080 |
| 28 | 1028 |
| 29 | -484 |
| 30 | -2377 |
| 31 | -2309 |
| 32 | 985 |
| 33 | 5222 |
| 34 | 5213 |
| 35 | -2005 |
| 36 | -11488 |
| 37 | -11724 |
| 38 | 4043 |
| 39 | 25226 |
| 40 | 26387 |
| 41 | -8062 |
| 42 | -55420 |