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 | -3 |
| 3 | -2 |
| 4 | 7 |
| 5 | 19 |
| 6 | 8 |
| 7 | -53 |
| 8 | -119 |
| 9 | -18 |
| 10 | 387 |
| 11 | 727 |
| 12 | -112 |
| 13 | -2745 |
| 14 | -4315 |
| 15 | 2238 |
| 16 | 18991 |
| 17 | 24715 |
| 18 | -24296 |
| 19 | -128461 |
| 20 | -135023 |
| 21 | 219502 |
| 22 | 850635 |
| 23 | 688239 |
| 24 | -1806560 |
| 25 | -5515441 |
| 26 | -3116403 |
| 27 | 14022398 |
| 28 | 34994967 |
| 29 | 10783939 |
| 30 | -104389592 |
| 31 | -216919973 |
| 32 | -5497639 |
| 33 | 752295022 |
| 34 | 1309660627 |