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 | -3 |
| 2 | 4 |
| 3 | -3 |
| 4 | -1 |
| 5 | 8 |
| 6 | -14 |
| 7 | 12 |
| 8 | 4 |
| 9 | -32 |
| 10 | 56 |
| 11 | -48 |
| 12 | -16 |
| 13 | 128 |
| 14 | -224 |
| 15 | 192 |
| 16 | 64 |
| 17 | -512 |
| 18 | 896 |
| 19 | -768 |
| 20 | -256 |
| 21 | 2048 |
| 22 | -3584 |
| 23 | 3072 |
| 24 | 1024 |
| 25 | -8192 |
| 26 | 14336 |
| 27 | -12288 |
| 28 | -4096 |
| 29 | 32768 |
| 30 | -57344 |
| 31 | 49152 |
| 32 | 16384 |
| 33 | -131072 |
| 34 | 229376 |
| 35 | -196608 |
| 36 | -65536 |
| 37 | 524288 |
| 38 | -917504 |
| 39 | 786432 |
| 40 | 262144 |
| 41 | -2097152 |