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 | -2 |
| 4 | 1 |
| 5 | -8 |
| 6 | 12 |
| 7 | 1 |
| 8 | -2 |
| 9 | 60 |
| 10 | -120 |
| 11 | 1 |
| 12 | -128 |
| 13 | -168 |
| 14 | 0 |
| 15 | 1680 |
| 16 | 1 |
| 17 | 2638 |
| 18 | 7320 |
| 19 | -5040 |
| 20 | -25200 |
| 21 | -30240 |
| 22 | 1 |
| 23 | -98408 |
| 24 | -300828 |
| 25 | 52800 |
| 26 | 1053360 |
| 27 | 1330560 |
| 28 | 665280 |
| 29 | 1 |
| 30 | 5307118 |
| 31 | 17914260 |
| 32 | 2522520 |
| 33 | -56456400 |
| 34 | -90810720 |
| 35 | -60540480 |
| 36 | -17297280 |