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 | 0 |
| 5 | -3 |
| 6 | 2 |
| 7 | 3 |
| 8 | -5 |
| 9 | -1 |
| 10 | 8 |
| 11 | -4 |
| 12 | -9 |
| 13 | 12 |
| 14 | 5 |
| 15 | -21 |
| 16 | 7 |
| 17 | 26 |
| 18 | -28 |
| 19 | -19 |
| 20 | 54 |
| 21 | -9 |
| 22 | -73 |
| 23 | 63 |
| 24 | 64 |
| 25 | -136 |
| 26 | -1 |
| 27 | 200 |
| 28 | -135 |
| 29 | -201 |
| 30 | 335 |
| 31 | 66 |
| 32 | -536 |
| 33 | 269 |
| 34 | 602 |
| 35 | -805 |
| 36 | -333 |
| 37 | 1407 |
| 38 | -472 |
| 39 | -1740 |
| 40 | 1879 |
| 41 | 1268 |
| 42 | -3619 |
| 43 | 611 |
| 44 | 4887 |
| 45 | -4230 |
| 46 | -4276 |
| 47 | 9117 |
| 48 | 46 |
| 49 | -13393 |
| 50 | 9071 |
| 51 | 13439 |
| 52 | -22464 |
| 53 | -4368 |
| 54 | 35903 |
| 55 | -18096 |