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 | 3 |
| 2 | 4 |
| 3 | 9 |
| 4 | 6 |
| 5 | 27 |
| 6 | -20 |
| 7 | 109 |
| 8 | -182 |
| 9 | 471 |
| 10 | -868 |
| 11 | 1737 |
| 12 | -2872 |
| 13 | 4345 |
| 14 | -4700 |
| 15 | 1133 |
| 16 | 14060 |
| 17 | -55275 |
| 18 | 150462 |
| 19 | -346093 |
| 20 | 717040 |
| 21 | -1369351 |
| 22 | 2432872 |
| 23 | -4002905 |
| 24 | 5964846 |
| 25 | -7524917 |
| 26 | 6123130 |
| 27 | 4900199 |
| 28 | -40900410 |
| 29 | 134309057 |
| 30 | -348584552 |
| 31 | 798958881 |
| 32 | -1678213106 |
| 33 | 3277459119 |