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 | -3 |
| 4 | 6 |
| 5 | -5 |
| 6 | 36 |
| 7 | -7 |
| 8 | -56 |
| 9 | 36 |
| 10 | 100 |
| 11 | -11 |
| 12 | -792 |
| 13 | -13 |
| 14 | 196 |
| 15 | 225 |
| 16 | 1820 |
| 17 | -17 |
| 18 | -2754 |
| 19 | -19 |
| 20 | -3800 |
| 21 | 441 |
| 22 | 484 |
| 23 | -23 |
| 24 | 48576 |
| 25 | 300 |
| 26 | 676 |
| 27 | -2925 |
| 28 | -10584 |
| 29 | -29 |
| 30 | -27000 |
| 31 | -31 |
| 32 | -201376 |
| 33 | 1089 |
| 34 | 1156 |
| 35 | 1225 |
| 36 | 396900 |
| 37 | -37 |
| 38 | 1444 |
| 39 | 1521 |
| 40 | 395200 |
| 41 | -41 |
| 42 | -74088 |
| 43 | -43 |
| 44 | -41624 |
| 45 | -44550 |