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 | 4 |
| 1 | 0 |
| 2 | 12 |
| 3 | -12 |
| 4 | 20 |
| 5 | -8 |
| 6 | 44 |
| 7 | -56 |
| 8 | 20 |
| 9 | 0 |
| 10 | 60 |
| 11 | -68 |
| 12 | 68 |
| 13 | -24 |
| 14 | 156 |
| 15 | -212 |
| 16 | 20 |
| 17 | 0 |
| 18 | 60 |
| 19 | -60 |
| 20 | 100 |
| 21 | -40 |
| 22 | 220 |
| 23 | -288 |
| 24 | 68 |
| 25 | 0 |
| 26 | 204 |
| 27 | -228 |
| 28 | 244 |
| 29 | -88 |
| 30 | 556 |
| 31 | -768 |
| 32 | 20 |
| 33 | 0 |
| 34 | 60 |
| 35 | -60 |
| 36 | 100 |
| 37 | -40 |
| 38 | 220 |
| 39 | -280 |
| 40 | 100 |
| 41 | 0 |
| 42 | 300 |
| 43 | -340 |
| 44 | 340 |
| 45 | -120 |
| 46 | 780 |
| 47 | -1068 |
| 48 | 68 |
| 49 | 0 |
| 50 | 204 |
| 51 | -204 |
| 52 | 340 |
| 53 | -136 |
| 54 | 748 |
| 55 | -976 |
| 56 | 244 |
| 57 | 0 |
| 58 | 732 |
| 59 | -820 |
| 60 | 868 |
| 61 | -312 |
| 62 | 1980 |
| 63 | -2748 |