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 | -2 |
| 3 | -16 |
| 4 | -64 |
| 5 | -208 |
| 6 | -608 |
| 7 | -1664 |
| 8 | -4352 |
| 9 | -11008 |
| 10 | -27136 |
| 11 | -65536 |
| 12 | -155648 |
| 13 | -364544 |
| 14 | -843776 |
| 15 | -1933312 |
| 16 | -4390912 |
| 17 | -9895936 |
| 18 | -22151168 |
| 19 | -49283072 |
| 20 | -109051904 |
| 21 | -240123904 |
| 22 | -526385152 |
| 23 | -1149239296 |
| 24 | -2499805184 |
| 25 | -5419040768 |