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 | 16 |
| 2 | -626 |
| 3 | -38240 |
| 4 | 1044556 |
| 5 | 151623616 |
| 6 | -2180514104 |
| 7 | -837280401536 |
| 8 | 66007653520 |
| 9 | 5908906635694336 |
| 10 | 94018537417467616 |
| 11 | -50612259928144561664 |
| 12 | -1721964008874583797056 |
| 13 | 508128734937488699898880 |
| 14 | 27874099084755797015426176 |
| 15 | -5828388033652017714104551424 |