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 | -1 |
| 2 | -8 |
| 3 | -19 |
| 4 | -21 |
| 5 | 139 |
| 6 | 448 |
| 7 | 1414 |
| 8 | 1206 |
| 9 | -3865 |
| 10 | -21271 |
| 11 | -65257 |
| 12 | -116480 |
| 13 | -76230 |
| 14 | 494952 |
| 15 | 2082603 |
| 16 | 5801391 |
| 17 | 10117600 |
| 18 | 8498261 |
| 19 | -25314504 |
| 20 | -144955267 |
| 21 | -405982721 |
| 22 | -858529330 |
| 23 | -1081275709 |
| 24 | 126891854 |
| 25 | 6202698189 |
| 26 | 22569319856 |
| 27 | 56419872881 |
| 28 | 102176753056 |