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 | -24 |
| 2 | 480 |
| 3 | -120 |
| 4 | 6720 |
| 5 | 3360 |
| 6 | -241920 |
| 7 | 1774080 |
| 8 | -560 |
| 9 | 40320 |
| 10 | 40320 |
| 11 | -1774080 |
| 12 | 20160 |
| 13 | -3548160 |
| 14 | 61501440 |
| 15 | -591360 |
| 16 | 92252160 |
| 17 | -1845043200 |
| 18 | 8364195840 |
| 19 | -2520 |
| 20 | 221760 |
| 21 | 221760 |
| 22 | -11531520 |
| 23 | 221760 |
| 24 | -23063040 |
| 25 | 461260800 |
| 26 | 110880 |
| 27 | -23063040 |
| 28 | -11531520 |
| 29 | 1383782400 |
| 30 | -15682867200 |
| 31 | -11531520 |
| 32 | 691891200 |
| 33 | 1383782400 |
| 34 | -62731468800 |
| 35 | 476759162880 |