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 | -4092 |
| 3 | -531433 |
| 4 | -16777200 |
| 5 | -244140593 |
| 6 | -2176782272 |
| 7 | -13841287073 |
| 8 | -68719476480 |
| 9 | -282429535969 |
| 10 | -999999998976 |
| 11 | -3138428374673 |
| 12 | -8916100444160 |
| 13 | -23298085114289 |
| 14 | -56693912358912 |
| 15 | -129746337857857 |
| 16 | -281474976645120 |