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 | -2 |
| 5 | -3 |
| 6 | 7 |
| 7 | -4 |
| 8 | -1 |
| 9 | 20 |
| 10 | -9 |
| 11 | -15 |
| 12 | 45 |
| 13 | -39 |
| 14 | -38 |
| 15 | 95 |
| 16 | -81 |
| 17 | -99 |
| 18 | 244 |
| 19 | -196 |
| 20 | -188 |
| 21 | 538 |
| 22 | -371 |
| 23 | -421 |
| 24 | 1256 |
| 25 | -823 |
| 26 | -820 |
| 27 | 2575 |
| 28 | -1672 |
| 29 | -1904 |
| 30 | 5367 |
| 31 | -3714 |
| 32 | -3861 |
| 33 | 10555 |
| 34 | -7362 |
| 35 | -8159 |
| 36 | 21391 |
| 37 | -14975 |
| 38 | -15592 |
| 39 | 41654 |
| 40 | -28293 |
| 41 | -30748 |
| 42 | 82026 |
| 43 | -54899 |
| 44 | -57331 |
| 45 | 155933 |