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 | 1 |
| 2 | -1 |
| 3 | 2 |
| 4 | -3 |
| 5 | 4 |
| 6 | 1 |
| 7 | -8 |
| 8 | 8 |
| 9 | 5 |
| 10 | -20 |
| 11 | 16 |
| 12 | -1 |
| 13 | 18 |
| 14 | -48 |
| 15 | 32 |
| 16 | -7 |
| 17 | 56 |
| 18 | -112 |
| 19 | 64 |
| 20 | 1 |
| 21 | -32 |
| 22 | 160 |
| 23 | -256 |
| 24 | 128 |
| 25 | 9 |
| 26 | -120 |
| 27 | 432 |
| 28 | -576 |
| 29 | 256 |
| 30 | -1 |
| 31 | 50 |
| 32 | -400 |
| 33 | 1120 |
| 34 | -1280 |
| 35 | 512 |
| 36 | -11 |
| 37 | 220 |
| 38 | -1232 |
| 39 | 2816 |
| 40 | -2816 |
| 41 | 1024 |
| 42 | 1 |
| 43 | -72 |
| 44 | 840 |
| 45 | -3584 |
| 46 | 6912 |
| 47 | -6144 |
| 48 | 2048 |
| 49 | 13 |
| 50 | -364 |
| 51 | 2912 |
| 52 | -9984 |
| 53 | 16640 |
| 54 | -13312 |
| 55 | 4096 |