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) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | -1 |
| 4 | 8 |
| 5 | -6 |
| 6 | 1 |
| 7 | 20 |
| 8 | -24 |
| 9 | 9 |
| 10 | -1 |
| 11 | 45 |
| 12 | -84 |
| 13 | 50 |
| 14 | -12 |
| 15 | 1 |
| 16 | 125 |
| 17 | -275 |
| 18 | 225 |
| 19 | -85 |
| 20 | 15 |
| 21 | -1 |
| 22 | 320 |
| 23 | -864 |
| 24 | 900 |
| 25 | -468 |
| 26 | 129 |
| 27 | -18 |
| 28 | 1 |
| 29 | 845 |
| 30 | -2639 |
| 31 | 3339 |
| 32 | -2219 |
| 33 | 840 |
| 34 | -182 |
| 35 | 21 |
| 36 | -1 |
| 37 | 2205 |
| 38 | -7896 |
| 39 | 11756 |
| 40 | -9528 |
| 41 | 4610 |
| 42 | -1368 |
| 43 | 244 |
| 44 | -24 |
| 45 | 1 |
| 46 | 5780 |
| 47 | -23256 |
| 48 | 39825 |
| 49 | -38121 |
| 50 | 22518 |
| 51 | -8532 |
| 52 | 2079 |
| 53 | -315 |
| 54 | 27 |
| 55 | -1 |
| 56 | 15125 |
| 57 | -67650 |
| 58 | 130975 |
| 59 | -144660 |
| 60 | 101065 |
| 61 | -46746 |
| 62 | 14525 |
| 63 | -3000 |
| 64 | 395 |
| 65 | -30 |
| 66 | 1 |