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 | -8 |
| 2 | 1 |
| 3 | 72 |
| 4 | -17 |
| 5 | 1 |
| 6 | -720 |
| 7 | 242 |
| 8 | -27 |
| 9 | 1 |
| 10 | 7920 |
| 11 | -3382 |
| 12 | 539 |
| 13 | -38 |
| 14 | 1 |
| 15 | -95040 |
| 16 | 48504 |
| 17 | -9850 |
| 18 | 995 |
| 19 | -50 |
| 20 | 1 |
| 21 | 1235520 |
| 22 | -725592 |
| 23 | 176554 |
| 24 | -22785 |
| 25 | 1645 |
| 26 | -63 |
| 27 | 1 |
| 28 | -17297280 |
| 29 | 11393808 |
| 30 | -3197348 |
| 31 | 495544 |
| 32 | -45815 |
| 33 | 2527 |
| 34 | -77 |
| 35 | 1 |
| 36 | 259459200 |
| 37 | -188204400 |
| 38 | 59354028 |
| 39 | -10630508 |
| 40 | 1182769 |
| 41 | -83720 |
| 42 | 3682 |
| 43 | -92 |
| 44 | 1 |