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 | 2 |
| 2 | -574 |
| 3 | -3460 |
| 4 | 988396 |
| 5 | 9976312 |
| 6 | -2836511816 |
| 7 | -40270873648 |
| 8 | 11395985060240 |
| 9 | 209004489868832 |
| 10 | -58863905303630816 |
| 11 | -1325773762049110592 |
| 12 | 371605162396386506944 |
| 13 | 9938777138365404080000 |
| 14 | -2772363635969717405017216 |
| 15 | -85969311875592284625394432 |
| 16 | 23864454100106265332248473856 |