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 | 6 |
| 1 | -24 |
| 2 | 60 |
| 3 | -120 |
| 4 | 210 |
| 5 | -336 |
| 6 | 504 |
| 7 | -720 |
| 8 | 990 |
| 9 | -1320 |
| 10 | 1716 |
| 11 | -2184 |
| 12 | 2730 |
| 13 | -3360 |
| 14 | 4080 |
| 15 | -4896 |
| 16 | 5814 |
| 17 | -6840 |
| 18 | 7980 |
| 19 | -9240 |
| 20 | 10626 |
| 21 | -12144 |
| 22 | 13800 |
| 23 | -15600 |
| 24 | 17550 |
| 25 | -19656 |
| 26 | 21924 |
| 27 | -24360 |
| 28 | 26970 |
| 29 | -29760 |
| 30 | 32736 |
| 31 | -35904 |
| 32 | 39270 |
| 33 | -42840 |
| 34 | 46620 |
| 35 | -50616 |
| 36 | 54834 |
| 37 | -59280 |
| 38 | 63960 |
| 39 | -68880 |
| 40 | 74046 |