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 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | 2 |
| 7 | -8 |
| 8 | 6 |
| 9 | -1 |
| 10 | 4 |
| 11 | -20 |
| 12 | 26 |
| 13 | -10 |
| 14 | 1 |
| 15 | 16 |
| 16 | -88 |
| 17 | 134 |
| 18 | -72 |
| 19 | 15 |
| 20 | -1 |
| 21 | 32 |
| 22 | -240 |
| 23 | 496 |
| 24 | -408 |
| 25 | 143 |
| 26 | -21 |
| 27 | 1 |
| 28 | 192 |
| 29 | -1504 |
| 30 | 3352 |
| 31 | -3112 |
| 32 | 1344 |
| 33 | -284 |
| 34 | 28 |
| 35 | -1 |
| 36 | 768 |
| 37 | -6400 |
| 38 | 16320 |
| 39 | -18496 |
| 40 | 10508 |
| 41 | -3108 |
| 42 | 480 |
| 43 | -36 |
| 44 | 1 |
| 45 | 4608 |
| 46 | -39936 |
| 47 | 109952 |