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) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | 1 |
| 3 | -2 |
| 4 | -1 |
| 5 | 4 |
| 6 | -3 |
| 7 | -3 |
| 8 | 0 |
| 9 | 12 |
| 10 | -4 |
| 11 | -5 |
| 12 | -4 |
| 13 | 4 |
| 14 | 32 |
| 15 | -5 |
| 16 | -7 |
| 17 | -8 |
| 18 | -4 |
| 19 | 16 |
| 20 | 80 |
| 21 | -6 |
| 22 | -9 |
| 23 | -12 |
| 24 | -12 |
| 25 | 0 |
| 26 | 48 |
| 27 | 192 |
| 28 | -7 |
| 29 | -11 |
| 30 | -16 |
| 31 | -20 |
| 32 | -16 |
| 33 | 16 |
| 34 | 128 |
| 35 | 448 |
| 36 | -8 |
| 37 | -13 |
| 38 | -20 |
| 39 | -28 |
| 40 | -32 |
| 41 | -16 |
| 42 | 64 |
| 43 | 320 |
| 44 | 1024 |
| 45 | -9 |
| 46 | -15 |
| 47 | -24 |
| 48 | -36 |
| 49 | -48 |
| 50 | -48 |
| 51 | 0 |
| 52 | 192 |
| 53 | 768 |
| 54 | 2304 |