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 | -1 |
| 5 | 1 |
| 6 | -2 |
| 7 | 2 |
| 8 | -2 |
| 9 | 3 |
| 10 | -5 |
| 11 | 6 |
| 12 | -7 |
| 13 | 11 |
| 14 | -16 |
| 15 | 20 |
| 16 | -27 |
| 17 | 39 |
| 18 | -55 |
| 19 | 75 |
| 20 | -102 |
| 21 | 145 |
| 22 | -207 |
| 23 | 286 |
| 24 | -397 |
| 25 | 565 |
| 26 | -802 |
| 27 | 1123 |
| 28 | -1581 |
| 29 | 2248 |
| 30 | -3193 |
| 31 | 4517 |
| 32 | -6399 |
| 33 | 9112 |
| 34 | -12984 |
| 35 | 18457 |
| 36 | -26270 |
| 37 | 37502 |
| 38 | -53553 |
| 39 | 76416 |
| 40 | -109146 |
| 41 | 156135 |
| 42 | -223446 |
| 43 | 319764 |
| 44 | -457884 |
| 45 | 656288 |
| 46 | -941081 |