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 | -2 |
| 2 | -6 |
| 3 | 4 |
| 4 | -54 |
| 5 | 28 |
| 6 | 132 |
| 7 | 124 |
| 8 | -4470 |
| 9 | 444 |
| 10 | 5964 |
| 11 | 2044 |
| 12 | 89028 |
| 13 | 8188 |
| 14 | 248172 |
| 15 | 9784 |
| 16 | -30229110 |
| 17 | 131068 |
| 18 | 7314348 |
| 19 | 524284 |
| 20 | 361466316 |
| 21 | 174136 |
| 22 | 354424812 |
| 23 | 8388604 |
| 24 | 54096506052 |
| 25 | 16344060 |
| 26 | 12926541804 |
| 27 | 46427196 |
| 28 | 1198466847468 |
| 29 | 536870908 |
| 30 | 216322653432 |