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 | -38 |
| 5 | 1 |
| 6 | 1 |
| 7 | -165 |
| 8 | -165 |
| 9 | 1 |
| 10 | 1 |
| 11 | -676 |
| 12 | 4806 |
| 13 | -676 |
| 14 | 1 |
| 15 | 1 |
| 16 | -2723 |
| 17 | 44452 |
| 18 | 44452 |
| 19 | -2723 |
| 20 | 1 |
| 21 | 1 |
| 22 | -10914 |
| 23 | 362895 |
| 24 | -1346780 |
| 25 | 362895 |
| 26 | -10914 |
| 27 | 1 |
| 28 | 1 |
| 29 | -43681 |
| 30 | 2780367 |
| 31 | -20297327 |
| 32 | -20297327 |
| 33 | 2780367 |
| 34 | -43681 |
| 35 | 1 |
| 36 | 1 |
| 37 | -174752 |
| 38 | 20554588 |
| 39 | -263879264 |
| 40 | 683233990 |
| 41 | -263879264 |
| 42 | 20554588 |
| 43 | -174752 |
| 44 | 1 |