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 | 1 |
| 4 | -58 |
| 5 | 1 |
| 6 | 1 |
| 7 | -307 |
| 8 | -307 |
| 9 | 1 |
| 10 | 1 |
| 11 | -1556 |
| 12 | 12006 |
| 13 | -1556 |
| 14 | 1 |
| 15 | 1 |
| 16 | -7805 |
| 17 | 140722 |
| 18 | 140722 |
| 19 | -7805 |
| 20 | 1 |
| 21 | 1 |
| 22 | -39054 |
| 23 | 1461615 |
| 24 | -5647300 |
| 25 | 1461615 |
| 26 | -39054 |
| 27 | 1 |
| 28 | 1 |
| 29 | -195303 |
| 30 | 14287093 |
| 31 | -109642851 |
| 32 | -109642851 |
| 33 | 14287093 |
| 34 | -195303 |
| 35 | 1 |
| 36 | 1 |
| 37 | -976552 |
| 38 | 135028828 |
| 39 | -1838120344 |
| 40 | 4873361350 |
| 41 | -1838120344 |
| 42 | 135028828 |
| 43 | -976552 |
| 44 | 1 |