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 | 1 |
| 3 | -80 |
| 4 | 1 |
| 5 | 626 |
| 6 | -80 |
| 7 | -2400 |
| 8 | 1 |
| 9 | 6481 |
| 10 | 626 |
| 11 | -14640 |
| 12 | -80 |
| 13 | 28562 |
| 14 | -2400 |
| 15 | -50080 |
| 16 | 1 |
| 17 | 83522 |
| 18 | 6481 |
| 19 | -130320 |
| 20 | 626 |
| 21 | 192000 |
| 22 | -14640 |
| 23 | -279840 |
| 24 | -80 |
| 25 | 391251 |
| 26 | 28562 |
| 27 | -524960 |
| 28 | -2400 |
| 29 | 707282 |
| 30 | -50080 |
| 31 | -923520 |
| 32 | 1 |
| 33 | 1171200 |
| 34 | 83522 |
| 35 | -1502400 |
| 36 | 6481 |
| 37 | 1874162 |
| 38 | -130320 |