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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 4 |
| 7 | 1 |
| 8 | 11 |
| 9 | -1 |
| 10 | 1 |
| 11 | 26 |
| 12 | -27 |
| 13 | 1 |
| 14 | 57 |
| 15 | -289 |
| 16 | -1 |
| 17 | 1 |
| 18 | 120 |
| 19 | -2160 |
| 20 | -256 |
| 21 | 1 |
| 22 | 247 |
| 23 | -13359 |
| 24 | -13604 |
| 25 | 1 |
| 26 | 1 |
| 27 | 502 |
| 28 | -73749 |
| 29 | -383750 |
| 30 | 3125 |
| 31 | 1 |
| 32 | 1013 |
| 33 | -378283 |
| 34 | -7682623 |
| 35 | 1006734 |
| 36 | 1 |
| 37 | 1 |
| 38 | 2036 |
| 39 | -1845522 |
| 40 | -124221692 |
| 41 | 126018521 |
| 42 | 46656 |