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 | 1 |
| 2 | -1 |
| 3 | -13 |
| 4 | -4 |
| 5 | 1 |
| 6 | 88 |
| 7 | 78 |
| 8 | 9 |
| 9 | -1 |
| 10 | -496 |
| 11 | -704 |
| 12 | -260 |
| 13 | -16 |
| 14 | 1 |
| 15 | 2560 |
| 16 | 4960 |
| 17 | 3080 |
| 18 | 650 |
| 19 | 25 |
| 20 | -1 |
| 21 | -12544 |
| 22 | -30720 |
| 23 | -26784 |
| 24 | -9856 |
| 25 | -1365 |
| 26 | -36 |
| 27 | 1 |
| 28 | 59392 |
| 29 | 175616 |
| 30 | 197120 |
| 31 | 104160 |
| 32 | 25872 |
| 33 | 2548 |
| 34 | 49 |
| 35 | -1 |
| 36 | -274432 |
| 37 | -950272 |
| 38 | -1304576 |
| 39 | -901120 |
| 40 | -327360 |
| 41 | -59136 |
| 42 | -4368 |
| 43 | -64 |
| 44 | 1 |
| 45 | 1245184 |
| 46 | 4939776 |
| 47 | 8017920 |
| 48 | 6849024 |
| 49 | 3294720 |