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 | -24 |
| 3 | -32 |
| 4 | 80 |
| 5 | 384 |
| 6 | 448 |
| 7 | -1024 |
| 8 | -4608 |
| 9 | -5120 |
| 10 | 11264 |
| 11 | 49152 |
| 12 | 53248 |
| 13 | -114688 |
| 14 | -491520 |
| 15 | -524288 |
| 16 | 1114112 |
| 17 | 4718592 |
| 18 | 4980736 |
| 19 | -10485760 |
| 20 | -44040192 |
| 21 | -46137344 |
| 22 | 96468992 |
| 23 | 402653184 |
| 24 | 419430400 |
| 25 | -872415232 |
| 26 | -3623878656 |
| 27 | -3758096384 |