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 | -5 |
| 3 | 1 |
| 4 | 40 |
| 5 | -15 |
| 6 | 1 |
| 7 | -440 |
| 8 | 235 |
| 9 | -30 |
| 10 | 1 |
| 11 | 6170 |
| 12 | -4200 |
| 13 | 775 |
| 14 | -50 |
| 15 | 1 |
| 16 | -105315 |
| 17 | 86020 |
| 18 | -20475 |
| 19 | 1925 |
| 20 | -75 |
| 21 | 1 |
| 22 | 2120610 |
| 23 | -2001055 |
| 24 | 577570 |
| 25 | -70525 |
| 26 | 4025 |
| 27 | -105 |
| 28 | 1 |
| 29 | -49242470 |
| 30 | 52305780 |
| 31 | -17609620 |
| 32 | 2623145 |
| 33 | -195300 |
| 34 | 7490 |
| 35 | -140 |
| 36 | 1 |
| 37 | 1296133195 |
| 38 | -1520815230 |
| 39 | 581516560 |
| 40 | -101595060 |
| 41 | 9264045 |
| 42 | -464940 |
| 43 | 12810 |
| 44 | -180 |
| 45 | 1 |