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 | 3 |
| 4 | -16 |
| 5 | -15 |
| 6 | -12 |
| 7 | -7 |
| 8 | -64 |
| 9 | -63 |
| 10 | -120 |
| 11 | -165 |
| 12 | 2304 |
| 13 | 2145 |
| 14 | 1680 |
| 15 | 945 |
| 16 | 16384 |
| 17 | 16065 |
| 18 | 30240 |
| 19 | 40755 |
| 20 | -921600 |
| 21 | -855855 |
| 22 | -665280 |
| 23 | -369495 |
| 24 | -9437184 |
| 25 | -9237375 |
| 26 | -17297280 |
| 27 | -23108085 |
| 28 | 722534400 |
| 29 | 670134465 |
| 30 | 518918400 |
| 31 | 286358625 |
| 32 | 9663676416 |
| 33 | 9449834625 |
| 34 | 17643225600 |
| 35 | 23454706275 |
| 36 | -936404582400 |