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 | 0 |
| 4 | -1 |
| 5 | 2 |
| 6 | -2 |
| 7 | 2 |
| 8 | -1 |
| 9 | -2 |
| 10 | 5 |
| 11 | -6 |
| 12 | 5 |
| 13 | -1 |
| 14 | -5 |
| 15 | 10 |
| 16 | -14 |
| 17 | 14 |
| 18 | -5 |
| 19 | -10 |
| 20 | 26 |
| 21 | -38 |
| 22 | 36 |
| 23 | -15 |
| 24 | -20 |
| 25 | 60 |
| 26 | -91 |
| 27 | 93 |
| 28 | -51 |
| 29 | -33 |
| 30 | 138 |
| 31 | -223 |
| 32 | 237 |
| 33 | -145 |
| 34 | -52 |
| 35 | 307 |
| 36 | -528 |
| 37 | 596 |
| 38 | -412 |
| 39 | -43 |
| 40 | 674 |
| 41 | -1258 |
| 42 | 1492 |
| 43 | -1126 |
| 44 | 84 |
| 45 | 1442 |
| 46 | -2938 |
| 47 | 3687 |
| 48 | -3034 |
| 49 | 680 |
| 50 | 3000 |
| 51 | -6818 |
| 52 | 9050 |
| 53 | -7997 |