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 | -2 |
| 4 | 1 |
| 5 | -3 |
| 6 | 1 |
| 7 | -4 |
| 8 | 2 |
| 9 | 1 |
| 10 | -5 |
| 11 | 5 |
| 12 | 1 |
| 13 | -6 |
| 14 | 9 |
| 15 | -10 |
| 16 | 1 |
| 17 | -7 |
| 18 | 14 |
| 19 | -35 |
| 20 | 1 |
| 21 | -8 |
| 22 | 20 |
| 23 | -80 |
| 24 | 26 |
| 25 | 1 |
| 26 | -9 |
| 27 | 27 |
| 28 | -150 |
| 29 | 117 |
| 30 | 1 |
| 31 | -10 |
| 32 | 35 |
| 33 | -250 |
| 34 | 325 |
| 35 | -454 |
| 36 | 1 |
| 37 | -11 |
| 38 | 44 |
| 39 | -385 |
| 40 | 715 |
| 41 | -2497 |
| 42 | 1 |
| 43 | -12 |
| 44 | 54 |
| 45 | -560 |
| 46 | 1365 |
| 47 | -8172 |
| 48 | 5914 |
| 49 | 1 |
| 50 | -13 |