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 | 2 |
| 1 | -16 |
| 2 | 18 |
| 3 | 176 |
| 4 | -544 |
| 5 | -160 |
| 6 | 2834 |
| 7 | -5104 |
| 8 | 3232 |
| 9 | 18032 |
| 10 | -68992 |
| 11 | 48400 |
| 12 | 143074 |
| 13 | -343088 |
| 14 | 461344 |
| 15 | 63888 |
| 16 | -2298880 |
| 17 | 2963520 |
| 18 | 1387424 |
| 19 | -5145536 |
| 20 | 10416514 |
| 21 | -9297312 |
| 22 | -31084704 |
| 23 | 42991712 |
| 24 | 34760672 |
| 25 | -51170800 |
| 26 | 81567168 |
| 27 | -94111088 |