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 | 6 |
| 6 | 1 |
| 7 | -13 |
| 8 | 1 |
| 9 | 43 |
| 10 | 1 |
| 11 | -131 |
| 12 | 1 |
| 13 | 430 |
| 14 | 1 |
| 15 | -1429 |
| 16 | 1 |
| 17 | 4863 |
| 18 | 1 |
| 19 | -16795 |
| 20 | 1 |
| 21 | 58787 |
| 22 | 1 |
| 23 | -208011 |
| 24 | 1 |
| 25 | 742901 |
| 26 | 1 |
| 27 | -2674439 |
| 28 | 1 |
| 29 | 9694846 |
| 30 | 1 |
| 31 | -35357669 |
| 32 | 1 |
| 33 | 129644791 |
| 34 | 1 |
| 35 | -477638699 |
| 36 | 1 |
| 37 | 1767263191 |
| 38 | 1 |
| 39 | -6564120419 |
| 40 | 1 |
| 41 | 24466267021 |
| 42 | 1 |
| 43 | -91482563639 |
| 44 | 1 |
| 45 | 343059613651 |