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 | 2 |
| 3 | 1 |
| 4 | 12 |
| 5 | 6 |
| 6 | -1 |
| 7 | 72 |
| 8 | 24 |
| 9 | -24 |
| 10 | 1 |
| 11 | 1440 |
| 12 | 120 |
| 13 | -960 |
| 14 | 200 |
| 15 | 37 |
| 16 | 43200 |
| 17 | -9360 |
| 18 | -44280 |
| 19 | 20640 |
| 20 | 3750 |
| 21 | -1493 |
| 22 | 1814400 |
| 23 | -997920 |
| 24 | -2484720 |
| 25 | 2028600 |
| 26 | 271740 |
| 27 | -378966 |
| 28 | 14017 |
| 29 | 25401600 |
| 30 | -23042880 |
| 31 | -42497280 |
| 32 | 54159840 |
| 33 | 3328080 |
| 34 | -18236064 |
| 35 | 1977248 |
| 36 | 751267 |