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 | -2 |
| 2 | -3 |
| 3 | 12 |
| 4 | -10 |
| 5 | -18 |
| 6 | 60 |
| 7 | -48 |
| 8 | -75 |
| 9 | 228 |
| 10 | -172 |
| 11 | -252 |
| 12 | 732 |
| 13 | -524 |
| 14 | -744 |
| 15 | 2088 |
| 16 | -1450 |
| 17 | -1998 |
| 18 | 5460 |
| 19 | -3704 |
| 20 | -4986 |
| 21 | 13344 |
| 22 | -8872 |
| 23 | -11736 |
| 24 | 30876 |
| 25 | -20206 |
| 26 | -26322 |
| 27 | 68268 |
| 28 | -44080 |
| 29 | -56682 |
| 30 | 145224 |
| 31 | -92672 |
| 32 | -117867 |
| 33 | 298800 |
| 34 | -188756 |
| 35 | -237744 |
| 36 | 597108 |
| 37 | -373852 |
| 38 | -466836 |