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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | -1 |
| 6 | 0 |
| 7 | -1 |
| 8 | 3 |
| 9 | 0 |
| 10 | -1 |
| 11 | 10 |
| 12 | 0 |
| 13 | -1 |
| 14 | 25 |
| 15 | -15 |
| 16 | 0 |
| 17 | -1 |
| 18 | 56 |
| 19 | -105 |
| 20 | 0 |
| 21 | -1 |
| 22 | 119 |
| 23 | -490 |
| 24 | 105 |
| 25 | 0 |
| 26 | -1 |
| 27 | 246 |
| 28 | -1918 |
| 29 | 1260 |
| 30 | 0 |
| 31 | -1 |
| 32 | 501 |
| 33 | -6825 |
| 34 | 9450 |
| 35 | -945 |
| 36 | 0 |
| 37 | -1 |
| 38 | 1012 |
| 39 | -22935 |
| 40 | 56980 |
| 41 | -17325 |
| 42 | 0 |
| 43 | -1 |
| 44 | 2035 |
| 45 | -74316 |
| 46 | 302995 |
| 47 | -190575 |
| 48 | 10395 |
| 49 | 0 |
| 50 | -1 |
| 51 | 4082 |
| 52 | -235092 |