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 | 0 |
| 4 | 0 |
| 5 | -3 |
| 6 | 4 |
| 7 | -3 |
| 8 | 4 |
| 9 | -2 |
| 10 | 0 |
| 11 | -6 |
| 12 | 9 |
| 13 | -10 |
| 14 | 10 |
| 15 | -5 |
| 16 | 10 |
| 17 | -16 |
| 18 | 20 |
| 19 | -28 |
| 20 | 22 |
| 21 | -18 |
| 22 | 19 |
| 23 | -32 |
| 24 | 54 |
| 25 | -50 |
| 26 | 45 |
| 27 | -38 |
| 28 | 44 |
| 29 | -78 |
| 30 | 106 |
| 31 | -118 |
| 32 | 96 |
| 33 | -98 |
| 34 | 110 |
| 35 | -129 |
| 36 | 192 |
| 37 | -216 |
| 38 | 204 |
| 39 | -182 |
| 40 | 213 |
| 41 | -286 |
| 42 | 368 |
| 43 | -412 |
| 44 | 366 |
| 45 | -362 |
| 46 | 394 |
| 47 | -524 |
| 48 | 676 |
| 49 | -714 |
| 50 | 680 |
| 51 | -641 |
| 52 | 742 |
| 53 | -936 |
| 54 | 1170 |