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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | -12 |
| 4 | 54 |
| 5 | -100 |
| 6 | 45 |
| 7 | -108 |
| 8 | 692 |
| 9 | -108 |
| 10 | -2970 |
| 11 | 1012 |
| 12 | 4542 |
| 13 | 13176 |
| 14 | -25168 |
| 15 | -33660 |
| 16 | 27864 |
| 17 | 97944 |
| 18 | 61641 |
| 19 | -295812 |
| 20 | -142780 |
| 21 | 227172 |
| 22 | 613548 |
| 23 | -32656 |
| 24 | -1181916 |
| 25 | 54000 |
| 26 | 449990 |
| 27 | 1389960 |
| 28 | -1340064 |
| 29 | -1153484 |
| 30 | 2112750 |
| 31 | 18684 |
| 32 | 1743312 |
| 33 | -6661260 |
| 34 | 733698 |
| 35 | 2254360 |
| 36 | 3347622 |