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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 114 |
| 7 | 78 |
| 8 | -216 |
| 9 | -2904 |
| 10 | -30120 |
| 11 | -30109 |
| 12 | -29988 |
| 13 | -28404 |
| 14 | -6096 |
| 15 | 330240 |
| 16 | 330224 |
| 17 | 329968 |
| 18 | 325344 |
| 19 | 237216 |
| 20 | -1530240 |
| 21 | -1530219 |
| 22 | -1529778 |
| 23 | -1519614 |
| 24 | -1275216 |
| 25 | 4845360 |
| 26 | 4845334 |
| 27 | 4844658 |
| 28 | 4825704 |
| 29 | 4275336 |
| 30 | -12255360 |
| 31 | -12255329 |
| 32 | -12254368 |
| 33 | -12222624 |