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 | -4 |
| 2 | 4 |
| 3 | 0 |
| 4 | 4 |
| 5 | -4 |
| 6 | -16 |
| 7 | 16 |
| 8 | 4 |
| 9 | 12 |
| 10 | -12 |
| 11 | -48 |
| 12 | 48 |
| 13 | 8 |
| 14 | 32 |
| 15 | -32 |
| 16 | -124 |
| 17 | 120 |
| 18 | 20 |
| 19 | 80 |
| 20 | -76 |
| 21 | -288 |
| 22 | 272 |
| 23 | 48 |
| 24 | 176 |
| 25 | -164 |
| 26 | -616 |
| 27 | 576 |
| 28 | 96 |
| 29 | 360 |
| 30 | -336 |
| 31 | -1248 |
| 32 | 1156 |
| 33 | 192 |
| 34 | 712 |
| 35 | -656 |
| 36 | -2412 |
| 37 | 2216 |
| 38 | 368 |
| 39 | 1344 |
| 40 | -1228 |
| 41 | -4488 |
| 42 | 4096 |
| 43 | 672 |
| 44 | 2448 |
| 45 | -2228 |
| 46 | -8096 |
| 47 | 7344 |
| 48 | 1200 |
| 49 | 4348 |
| 50 | -3932 |