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 | 4 |
| 1 | -8 |
| 2 | 28 |
| 3 | -8 |
| 4 | 248 |
| 5 | -16 |
| 6 | 508 |
| 7 | -136 |
| 8 | 584 |
| 9 | -496 |
| 10 | 16376 |
| 11 | -16 |
| 12 | 131056 |
| 13 | -174752 |
| 14 | 18724 |
| 15 | -2056 |
| 16 | 1048568 |
| 17 | -1168 |
| 18 | 4194296 |
| 19 | -20336 |
| 20 | 684784 |
| 21 | -1945184 |
| 22 | 67108856 |
| 23 | -3856 |
| 24 | 536870896 |
| 25 | -715827872 |
| 26 | 306783376 |
| 27 | -19746976 |
| 28 | 17179869152 |
| 29 | -3198784 |
| 30 | 8589934588 |
| 31 | -134744072 |
| 32 | 426829048 |
| 33 | -91625968976 |