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) |
|---|---|
| 3 | 1 |
| 4 | -1 |
| 5 | 4 |
| 6 | 1 |
| 7 | -8 |
| 8 | 10 |
| 9 | -1 |
| 10 | 12 |
| 11 | -30 |
| 12 | 20 |
| 13 | 1 |
| 14 | -64 |
| 15 | 600 |
| 16 | -1600 |
| 17 | 1225 |
| 18 | -1 |
| 19 | 80 |
| 20 | -1000 |
| 21 | 4000 |
| 22 | -6125 |
| 23 | 3136 |
| 24 | 1 |
| 25 | -96 |
| 26 | 1500 |
| 27 | -8000 |
| 28 | 18375 |
| 29 | -18816 |
| 30 | 7056 |
| 31 | -1 |
| 32 | 448 |
| 33 | -21000 |
| 34 | 280000 |
| 35 | -1500625 |
| 36 | 3687936 |
| 37 | -4148928 |
| 38 | 1728000 |
| 39 | 1 |
| 40 | -512 |
| 41 | 28000 |
| 42 | -448000 |
| 43 | 3001250 |
| 44 | -9834496 |
| 45 | 16595712 |
| 46 | -13824000 |
| 47 | 4492125 |
| 48 | -1 |