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 | -12 |
| 2 | 54 |
| 3 | -112 |
| 4 | 189 |
| 5 | -804 |
| 6 | 2534 |
| 7 | -4104 |
| 8 | 8202 |
| 9 | -28116 |
| 10 | 62976 |
| 11 | -109224 |
| 12 | 254223 |
| 13 | -612048 |
| 14 | 1262910 |
| 15 | -2518896 |
| 16 | 5112144 |
| 17 | -11106144 |
| 18 | 23407814 |
| 19 | -44129784 |
| 20 | 87494994 |
| 21 | -185162108 |
| 22 | 362468046 |
| 23 | -687455256 |
| 24 | 1354087433 |