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 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | -2 |
| 4 | 0 |
| 5 | 1 |
| 6 | -8 |
| 7 | -6 |
| 8 | 0 |
| 9 | 1 |
| 10 | -36 |
| 11 | -32 |
| 12 | -12 |
| 13 | 0 |
| 14 | 1 |
| 15 | -224 |
| 16 | -180 |
| 17 | -80 |
| 18 | -20 |
| 19 | 0 |
| 20 | 1 |
| 21 | -1880 |
| 22 | -1344 |
| 23 | -540 |
| 24 | -160 |
| 25 | -30 |
| 26 | 0 |
| 27 | 1 |
| 28 | -19872 |
| 29 | -13160 |
| 30 | -4704 |
| 31 | -1260 |
| 32 | -280 |
| 33 | -42 |
| 34 | 0 |
| 35 | 1 |
| 36 | -251888 |
| 37 | -158976 |
| 38 | -52640 |
| 39 | -12544 |
| 40 | -2520 |
| 41 | -448 |
| 42 | -56 |
| 43 | 0 |
| 44 | 1 |
| 45 | -3712256 |
| 46 | -2266992 |