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 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | -1 |
| 9 | 1 |
| 10 | 0 |
| 11 | 1 |
| 12 | -2 |
| 13 | 0 |
| 14 | -2 |
| 15 | 4 |
| 16 | -2 |
| 17 | 3 |
| 18 | -4 |
| 19 | 4 |
| 20 | -7 |
| 21 | 8 |
| 22 | -8 |
| 23 | 13 |
| 24 | -15 |
| 25 | 16 |
| 26 | -23 |
| 27 | 27 |
| 28 | -32 |
| 29 | 42 |
| 30 | -50 |
| 31 | 63 |
| 32 | -80 |
| 33 | 94 |
| 34 | -119 |
| 35 | 150 |
| 36 | -180 |
| 37 | 225 |
| 38 | -279 |
| 39 | 344 |
| 40 | -427 |
| 41 | 526 |
| 42 | -652 |
| 43 | 807 |
| 44 | -998 |
| 45 | 1235 |
| 46 | -1526 |
| 47 | 1892 |
| 48 | -2339 |
| 49 | 2889 |
| 50 | -3581 |
| 51 | 4427 |
| 52 | -5476 |
| 53 | 6779 |
| 54 | -8382 |
| 55 | 10378 |