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 | 1 |
| 3 | 3 |
| 4 | -4 |
| 5 | 1 |
| 6 | 6 |
| 7 | 0 |
| 8 | -7 |
| 9 | 1 |
| 10 | -8 |
| 11 | 38 |
| 12 | -21 |
| 13 | -10 |
| 14 | 1 |
| 15 | -501 |
| 16 | 692 |
| 17 | -119 |
| 18 | -60 |
| 19 | -13 |
| 20 | 1 |
| 21 | -13623 |
| 22 | 14910 |
| 23 | -420 |
| 24 | -735 |
| 25 | -117 |
| 26 | -16 |
| 27 | 1 |
| 28 | -409953 |
| 29 | 401802 |
| 30 | 22911 |
| 31 | -12470 |
| 32 | -2080 |
| 33 | -192 |
| 34 | -19 |
| 35 | 1 |
| 36 | -14544683 |
| 37 | 13278520 |
| 38 | 1577527 |
| 39 | -255570 |
| 40 | -51064 |
| 41 | -4424 |
| 42 | -285 |
| 43 | -22 |
| 44 | 1 |