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 | -6 |
| 3 | 1 |
| 4 | 72 |
| 5 | -18 |
| 6 | 1 |
| 7 | -1296 |
| 8 | 396 |
| 9 | -36 |
| 10 | 1 |
| 11 | 31104 |
| 12 | -10800 |
| 13 | 1260 |
| 14 | -60 |
| 15 | 1 |
| 16 | -933120 |
| 17 | 355104 |
| 18 | -48600 |
| 19 | 3060 |
| 20 | -90 |
| 21 | 1 |
| 22 | 33592320 |
| 23 | -13716864 |
| 24 | 2104704 |
| 25 | -158760 |
| 26 | 6300 |
| 27 | -126 |
| 28 | 1 |
| 29 | -1410877440 |
| 30 | 609700608 |
| 31 | -102114432 |
| 32 | 8772624 |
| 33 | -423360 |
| 34 | 11592 |
| 35 | -168 |