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 | 6 |
| 2 | -21 |
| 3 | 76 |
| 4 | -345 |
| 5 | 1734 |
| 6 | -8906 |
| 7 | 46662 |
| 8 | -250257 |
| 9 | 1365388 |
| 10 | -7538421 |
| 11 | 42030150 |
| 12 | -236312690 |
| 13 | 1338000774 |
| 14 | -7620721077 |
| 15 | 43626920908 |
| 16 | -250869973089 |
| 17 | 1448248263558 |
| 18 | -8389624496618 |
| 19 | 48751103123142 |
| 20 | -284073748405401 |
| 21 | 1659452645344972 |
| 22 | -9715933503018165 |