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 | 4 |
| 3 | -3 |
| 4 | 36 |
| 5 | -27 |
| 6 | -5 |
| 7 | 144 |
| 8 | -108 |
| 9 | -20 |
| 10 | -7 |
| 11 | 3600 |
| 12 | -2700 |
| 13 | -500 |
| 14 | -175 |
| 15 | -81 |
| 16 | 3600 |
| 17 | -2700 |
| 18 | -500 |
| 19 | -175 |
| 20 | -81 |
| 21 | -44 |
| 22 | 176400 |
| 23 | -132300 |
| 24 | -24500 |
| 25 | -8575 |
| 26 | -3969 |
| 27 | -2156 |
| 28 | -1300 |
| 29 | 705600 |
| 30 | -529200 |
| 31 | -98000 |
| 32 | -34300 |
| 33 | -15876 |
| 34 | -8624 |
| 35 | -5200 |
| 36 | -3375 |
| 37 | 6350400 |
| 38 | -4762800 |
| 39 | -882000 |
| 40 | -308700 |
| 41 | -142884 |
| 42 | -77616 |
| 43 | -46800 |
| 44 | -30375 |
| 45 | -20825 |