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 | -1 |
| 4 | 2 |
| 5 | 1 |
| 6 | -4 |
| 7 | -1 |
| 8 | 6 |
| 9 | 1 |
| 10 | -8 |
| 11 | 4 |
| 12 | -1 |
| 13 | 10 |
| 14 | -12 |
| 15 | 1 |
| 16 | -12 |
| 17 | 24 |
| 18 | -1 |
| 19 | 14 |
| 20 | -40 |
| 21 | 8 |
| 22 | 1 |
| 23 | -16 |
| 24 | 60 |
| 25 | -32 |
| 26 | -1 |
| 27 | 18 |
| 28 | -84 |
| 29 | 80 |
| 30 | 1 |
| 31 | -20 |
| 32 | 112 |
| 33 | -160 |
| 34 | 16 |
| 35 | -1 |
| 36 | 22 |
| 37 | -144 |
| 38 | 280 |
| 39 | -80 |
| 40 | 1 |
| 41 | -24 |
| 42 | 180 |
| 43 | -448 |
| 44 | 240 |
| 45 | -1 |
| 46 | 26 |
| 47 | -220 |
| 48 | 672 |
| 49 | -560 |
| 50 | 32 |
| 51 | 1 |
| 52 | -28 |
| 53 | 264 |
| 54 | -960 |
| 55 | 1120 |
| 56 | -192 |
| 57 | -1 |
| 58 | 30 |
| 59 | -312 |
| 60 | 1320 |
| 61 | -2016 |
| 62 | 672 |
| 63 | 1 |
| 64 | -32 |
| 65 | 364 |
| 66 | -1760 |
| 67 | 3360 |
| 68 | -1792 |
| 69 | 64 |
| 70 | -1 |
| 71 | 34 |
| 72 | -420 |
| 73 | 2288 |
| 74 | -5280 |
| 75 | 4032 |
| 76 | -448 |