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 | 2 |
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | 8 |
| 6 | 1 |
| 7 | -28 |
| 8 | 1 |
| 9 | 134 |
| 10 | 1 |
| 11 | -649 |
| 12 | 1 |
| 13 | 3320 |
| 14 | 1 |
| 15 | -17497 |
| 16 | 1 |
| 17 | 94526 |
| 18 | 1 |
| 19 | -520507 |
| 20 | 1 |
| 21 | 2910896 |
| 22 | 1 |
| 23 | -16487794 |
| 24 | 1 |
| 25 | 94393106 |
| 26 | 1 |
| 27 | -545337199 |
| 28 | 1 |
| 29 | 3175320608 |
| 30 | 1 |
| 31 | -18615098836 |
| 32 | 1 |
| 33 | 109783526822 |
| 34 | 1 |
| 35 | -650884962907 |
| 36 | 1 |
| 37 | 3877184797784 |
| 38 | 1 |
| 39 | -23193307022860 |
| 40 | 1 |
| 41 | 139271612505362 |