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 | -9 |
| 3 | -28 |
| 4 | 8 |
| 5 | -126 |
| 6 | 252 |
| 7 | -344 |
| 8 | 0 |
| 9 | 27 |
| 10 | 1134 |
| 11 | -1332 |
| 12 | -224 |
| 13 | -2198 |
| 14 | 3096 |
| 15 | 3528 |
| 16 | 0 |
| 17 | -4914 |
| 18 | -243 |
| 19 | -6860 |
| 20 | -1008 |
| 21 | 9632 |
| 22 | 11988 |
| 23 | -12168 |
| 24 | 0 |
| 25 | 125 |
| 26 | 19782 |
| 27 | 0 |
| 28 | -2752 |
| 29 | -24390 |
| 30 | -31752 |
| 31 | -29792 |
| 32 | 0 |
| 33 | 37296 |
| 34 | 44226 |
| 35 | 43344 |
| 36 | 216 |
| 37 | -50654 |
| 38 | 61740 |
| 39 | 61544 |
| 40 | 0 |
| 41 | -68922 |
| 42 | -86688 |