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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -10 |
| 5 | 1 |
| 6 | 1 |
| 7 | -25 |
| 8 | -25 |
| 9 | 1 |
| 10 | 1 |
| 11 | -56 |
| 12 | 246 |
| 13 | -56 |
| 14 | 1 |
| 15 | 1 |
| 16 | -119 |
| 17 | 1072 |
| 18 | 1072 |
| 19 | -119 |
| 20 | 1 |
| 21 | 1 |
| 22 | -246 |
| 23 | 4047 |
| 24 | -11572 |
| 25 | 4047 |
| 26 | -246 |
| 27 | 1 |
| 28 | 1 |
| 29 | -501 |
| 30 | 14107 |
| 31 | -74127 |
| 32 | -74127 |
| 33 | 14107 |
| 34 | -501 |
| 35 | 1 |
| 36 | 1 |
| 37 | -1012 |
| 38 | 46828 |
| 39 | -408364 |
| 40 | 901990 |
| 41 | -408364 |
| 42 | 46828 |
| 43 | -1012 |
| 44 | 1 |
| 45 | 1 |
| 46 | -2035 |
| 47 | 150602 |
| 48 | -2052886 |
| 49 | 7685228 |
| 50 | 7685228 |
| 51 | -2052886 |
| 52 | 150602 |
| 53 | -2035 |
| 54 | 1 |