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 | 2 |
| 2 | -1 |
| 3 | 5 |
| 4 | -4 |
| 5 | 1 |
| 6 | 17 |
| 7 | -17 |
| 8 | 7 |
| 9 | -1 |
| 10 | 74 |
| 11 | -85 |
| 12 | 45 |
| 13 | -11 |
| 14 | 1 |
| 15 | 394 |
| 16 | -499 |
| 17 | 310 |
| 18 | -100 |
| 19 | 16 |
| 20 | -1 |
| 21 | 2484 |
| 22 | -3388 |
| 23 | 2359 |
| 24 | -910 |
| 25 | 196 |
| 26 | -22 |
| 27 | 1 |
| 28 | 18108 |
| 29 | -26200 |
| 30 | 19901 |
| 31 | -8729 |
| 32 | 2282 |
| 33 | -350 |
| 34 | 29 |
| 35 | -1 |
| 36 | 149904 |
| 37 | -227708 |
| 38 | 185408 |
| 39 | -89733 |
| 40 | 26985 |
| 41 | -5082 |
| 42 | 582 |
| 43 | -37 |
| 44 | 1 |
| 45 | 1389456 |
| 46 | -2199276 |
| 47 | 1896380 |
| 48 | -993005 |
| 49 | 332598 |
| 50 | -72723 |
| 51 | 10320 |
| 52 | -915 |
| 53 | 46 |
| 54 | -1 |