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 | 0 |
| 2 | -1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 4 |
| 7 | 6 |
| 8 | 0 |
| 9 | -1 |
| 10 | -12 |
| 11 | -32 |
| 12 | -20 |
| 13 | 0 |
| 14 | 1 |
| 15 | 32 |
| 16 | 120 |
| 17 | 140 |
| 18 | 50 |
| 19 | 0 |
| 20 | -1 |
| 21 | -80 |
| 22 | -384 |
| 23 | -648 |
| 24 | -448 |
| 25 | -105 |
| 26 | 0 |
| 27 | 1 |
| 28 | 192 |
| 29 | 1120 |
| 30 | 2464 |
| 31 | 2520 |
| 32 | 1176 |
| 33 | 196 |
| 34 | 0 |
| 35 | -1 |
| 36 | -448 |
| 37 | -3072 |
| 38 | -8320 |
| 39 | -11264 |
| 40 | -7920 |
| 41 | -2688 |
| 42 | -336 |
| 43 | 0 |
| 44 | 1 |
| 45 | 1024 |
| 46 | 8064 |
| 47 | 25920 |
| 48 | 43680 |