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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 6 |
| 6 | 2 |
| 7 | -20 |
| 8 | -102 |
| 9 | -312 |
| 10 | -795 |
| 11 | -1483 |
| 12 | -1102 |
| 13 | 7035 |
| 14 | 51059 |
| 15 | 219453 |
| 16 | 779078 |
| 17 | 2307104 |
| 18 | 5508377 |
| 19 | 7633065 |
| 20 | -19349069 |
| 21 | -226127800 |
| 22 | -1296826960 |
| 23 | -5855601434 |
| 24 | -22970901723 |
| 25 | -78578482054 |
| 26 | -224208769108 |
| 27 | -429111559993 |
| 28 | 429212740026 |
| 29 | 10534398465308 |