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 | -6 |
| 5 | 1 |
| 6 | 1 |
| 7 | -12 |
| 8 | 20 |
| 9 | -1 |
| 10 | 1 |
| 11 | -18 |
| 12 | 75 |
| 13 | -50 |
| 14 | 1 |
| 15 | 1 |
| 16 | -24 |
| 17 | 166 |
| 18 | -328 |
| 19 | 105 |
| 20 | -1 |
| 21 | 1 |
| 22 | -30 |
| 23 | 293 |
| 24 | -1050 |
| 25 | 1134 |
| 26 | -196 |
| 27 | 1 |
| 28 | 1 |
| 29 | -36 |
| 30 | 456 |
| 31 | -2432 |
| 32 | 5140 |
| 33 | -3312 |
| 34 | 336 |
| 35 | -1 |
| 36 | 1 |
| 37 | -42 |
| 38 | 655 |
| 39 | -4690 |
| 40 | 15471 |
| 41 | -20814 |
| 42 | 8514 |
| 43 | -540 |
| 44 | 1 |
| 45 | 1 |
| 46 | -48 |
| 47 | 890 |
| 48 | -8040 |
| 49 | 36771 |
| 50 | -80584 |