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 | -2 |
| 2 | -4 |
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | -12 |
| 7 | -28 |
| 8 | -28 |
| 9 | -56 |
| 10 | 64 |
| 11 | 68 |
| 12 | 152 |
| 13 | 144 |
| 14 | -20 |
| 15 | -72 |
| 16 | -678 |
| 17 | -508 |
| 18 | -424 |
| 19 | 92 |
| 20 | 824 |
| 21 | 1512 |
| 22 | 2204 |
| 23 | 1036 |
| 24 | 936 |
| 25 | -1900 |
| 26 | -2936 |
| 27 | -6444 |
| 28 | -5656 |
| 29 | -4384 |
| 30 | -4808 |
| 31 | 6540 |
| 32 | 10080 |
| 33 | 21256 |
| 34 | 20296 |
| 35 | 24424 |
| 36 | 13520 |
| 37 | -7856 |
| 38 | -28836 |
| 39 | -55744 |
| 40 | -72240 |
| 41 | -92960 |
| 42 | -48424 |
| 43 | -40772 |
| 44 | 36168 |
| 45 | 106464 |
| 46 | 199996 |