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 | 0 |
| 2 | -1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 3 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | -1 |
| 10 | 0 |
| 11 | 2 |
| 12 | 5 |
| 13 | -30 |
| 14 | 15 |
| 15 | 0 |
| 16 | 0 |
| 17 | -2 |
| 18 | -5 |
| 19 | 10 |
| 20 | -3 |
| 21 | 0 |
| 22 | -16 |
| 23 | -42 |
| 24 | 91 |
| 25 | 315 |
| 26 | -315 |
| 27 | 63 |
| 28 | 0 |
| 29 | 0 |
| 30 | 16 |
| 31 | 42 |
| 32 | -7 |
| 33 | -105 |
| 34 | 63 |
| 35 | -9 |
| 36 | 0 |
| 37 | 144 |
| 38 | 404 |
| 39 | -540 |
| 40 | -2345 |
| 41 | -840 |
| 42 | 3150 |
| 43 | -1260 |
| 44 | 135 |
| 45 | 0 |
| 46 | 0 |
| 47 | -144 |
| 48 | -404 |
| 49 | -100 |
| 50 | 665 |
| 51 | 448 |
| 52 | -630 |
| 53 | 180 |
| 54 | -15 |
| 55 | 0 |
| 56 | -768 |
| 57 | -2288 |
| 58 | 2068 |
| 59 | 11792 |
| 60 | 8195 |
| 61 | -8085 |
| 62 | -8778 |
| 63 | 6930 |
| 64 | -1485 |
| 65 | 99 |