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 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 3 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 11 |
| 13 | 5 |
| 14 | 1 |
| 15 | -1 |
| 16 | 1 |
| 17 | 41 |
| 18 | 29 |
| 19 | 7 |
| 20 | 1 |
| 21 | -1 |
| 22 | 1 |
| 23 | 153 |
| 24 | 169 |
| 25 | 55 |
| 26 | 9 |
| 27 | 1 |
| 28 | 1 |
| 29 | 1 |
| 30 | 571 |
| 31 | 985 |
| 32 | 433 |
| 33 | 89 |
| 34 | 11 |
| 35 | 1 |
| 36 | 1 |
| 37 | 1 |
| 38 | 2131 |
| 39 | 5741 |
| 40 | 3409 |
| 41 | 881 |
| 42 | 131 |
| 43 | 13 |
| 44 | 1 |
| 45 | -1 |
| 46 | 1 |
| 47 | 7953 |
| 48 | 33461 |
| 49 | 26839 |
| 50 | 8721 |
| 51 | 1561 |
| 52 | 181 |
| 53 | 15 |
| 54 | 1 |