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 | 2 |
| 3 | 6 |
| 4 | -6 |
| 5 | 24 |
| 6 | -18 |
| 7 | -48 |
| 8 | 120 |
| 9 | 18 |
| 10 | -72 |
| 11 | -192 |
| 12 | 48 |
| 13 | -360 |
| 14 | 720 |
| 15 | 54 |
| 16 | 144 |
| 17 | -360 |
| 18 | 384 |
| 19 | -960 |
| 20 | 144 |
| 21 | -1800 |
| 22 | 720 |
| 23 | -2880 |
| 24 | 5040 |
| 25 | -54 |
| 26 | 216 |
| 27 | 576 |
| 28 | -144 |
| 29 | 1080 |
| 30 | -2160 |
| 31 | 1536 |
| 32 | -384 |
| 33 | 2880 |
| 34 | -5760 |
| 35 | -144 |
| 36 | 576 |
| 37 | 5400 |
| 38 | -10800 |
| 39 | 2880 |
| 40 | -720 |
| 41 | -17280 |
| 42 | 8640 |
| 43 | -25200 |
| 44 | 40320 |
| 45 | -162 |
| 46 | -432 |
| 47 | 1080 |