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 | -4 |
| 3 | -9 |
| 4 | 11 |
| 5 | 56 |
| 6 | 1 |
| 7 | -279 |
| 8 | -284 |
| 9 | 1111 |
| 10 | 2531 |
| 11 | -3024 |
| 12 | -15679 |
| 13 | -559 |
| 14 | 77836 |
| 15 | 80631 |
| 16 | -308549 |
| 17 | -711704 |
| 18 | 831041 |
| 19 | 4389561 |
| 20 | 234356 |
| 21 | -21713449 |
| 22 | -22885229 |
| 23 | 85682016 |
| 24 | 200108161 |
| 25 | -228301919 |
| 26 | -1228842724 |
| 27 | -87333129 |
| 28 | 6056880491 |
| 29 | 6493546136 |
| 30 | -23790856319 |
| 31 | -56258586999 |
| 32 | 62695694596 |
| 33 | 343988629591 |