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 | 34 |
| 2 | -766 |
| 3 | -156740 |
| 4 | -912404 |
| 5 | 1173995384 |
| 6 | 48684045496 |
| 7 | -11883257221424 |
| 8 | -1059025893631600 |
| 9 | 146710082653141024 |
| 10 | 23307172718246211616 |
| 11 | -2027323916172999286336 |
| 12 | -561689258759043381720896 |
| 13 | 27660764004806580561543040 |
| 14 | 14974833795516881674770770816 |