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) |
|---|---|
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -3 |
| 6 | 3 |
| 7 | -8 |
| 8 | -5 |
| 9 | -5 |
| 10 | -24 |
| 11 | 7 |
| 12 | 0 |
| 13 | 0 |
| 14 | 9 |
| 15 | 9 |
| 16 | -81312 |
| 17 | -1341867 |
| 18 | 11 |
| 19 | -19685120 |
| 20 | -13 |
| 21 | -13 |
| 22 | 0 |
| 23 | -15 |
| 24 | 0 |
| 25 | -180287762432 |
| 26 | 17 |
| 27 | -1407939911477 |
| 28 | 10526233598464 |
| 29 | 19 |
| 30 | 19 |
| 31 | 0 |
| 32 | 6040299856799 |
| 33 | -21 |
| 34 | 29830847001120768 |
| 35 | 23 |
| 36 | -23 |
| 37 | 0 |
| 38 | 115407361849089836 |
| 39 | -25 |
| 40 | 0 |
| 41 | 27 |
| 42 | 104060523591574200 |