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 | -48 |
| 2 | -4608 |
| 3 | -2926656 |
| 4 | -919916544 |
| 5 | -434180785824 |
| 6 | -182989456349184 |
| 7 | -85043754451706496 |
| 8 | -39190139442556010496 |
| 9 | -18607302407649844554480 |
| 10 | -8899353903793993480829952 |
| 11 | -4312672556860403013966227136 |
| 12 | -2105991149652021429396842987520 |