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 | 4 |
| 2 | -4 |
| 3 | 1 |
| 4 | 4 |
| 5 | -16 |
| 6 | 20 |
| 7 | -8 |
| 8 | 1 |
| 9 | 4 |
| 10 | -36 |
| 11 | 105 |
| 12 | -112 |
| 13 | 54 |
| 14 | -12 |
| 15 | 1 |
| 16 | 4 |
| 17 | -64 |
| 18 | 336 |
| 19 | -672 |
| 20 | 660 |
| 21 | -352 |
| 22 | 104 |
| 23 | -16 |
| 24 | 1 |
| 25 | 4 |
| 26 | -100 |
| 27 | 825 |
| 28 | -2640 |
| 29 | 4290 |
| 30 | -4004 |
| 31 | 2275 |
| 32 | -800 |
| 33 | 170 |
| 34 | -20 |
| 35 | 1 |
| 36 | 4 |
| 37 | -144 |
| 38 | 1716 |
| 39 | -8008 |
| 40 | 19305 |
| 41 | -27456 |
| 42 | 24752 |
| 43 | -14688 |
| 44 | 5814 |
| 45 | -1520 |
| 46 | 252 |
| 47 | -24 |
| 48 | 1 |
| 49 | 4 |
| 50 | -196 |
| 51 | 3185 |
| 52 | -20384 |
| 53 | 68068 |
| 54 | -136136 |
| 55 | 176358 |
| 56 | -155040 |
| 57 | 94962 |
| 58 | -40964 |
| 59 | 12397 |
| 60 | -2576 |
| 61 | 350 |
| 62 | -28 |
| 63 | 1 |