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 | -42 |
| 2 | 798 |
| 3 | -9044 |
| 4 | 67830 |
| 5 | -352716 |
| 6 | 1293292 |
| 7 | -3325608 |
| 8 | 5819814 |
| 9 | -6466460 |
| 10 | 3879876 |
| 11 | -705432 |
| 12 | -117572 |
| 13 | -54264 |
| 14 | -38760 |
| 15 | -36176 |
| 16 | -40698 |
| 17 | -52668 |
| 18 | -76076 |
| 19 | -120120 |
| 20 | -204204 |
| 21 | -369512 |
| 22 | -705432 |
| 23 | -1410864 |
| 24 | -2939300 |
| 25 | -6348888 |
| 26 | -14162904 |
| 27 | -32522224 |
| 28 | -76659528 |
| 29 | -185040240 |