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 | 0 |
| 6 | 1 |
| 7 | -1 |
| 8 | -1 |
| 9 | -1 |
| 10 | 1 |
| 11 | -1 |
| 12 | -3 |
| 13 | -2 |
| 14 | 1 |
| 15 | 1 |
| 16 | -1 |
| 17 | -7 |
| 18 | -6 |
| 19 | 2 |
| 20 | -1 |
| 21 | 1 |
| 22 | -1 |
| 23 | -15 |
| 24 | -20 |
| 25 | 6 |
| 26 | -1 |
| 27 | 1 |
| 28 | 1 |
| 29 | -1 |
| 30 | -31 |
| 31 | -66 |
| 32 | 20 |
| 33 | 5 |
| 34 | 4 |
| 35 | -1 |
| 36 | 1 |
| 37 | -1 |
| 38 | -63 |
| 39 | -212 |
| 40 | 66 |
| 41 | 71 |
| 42 | 40 |
| 43 | -1 |
| 44 | 2 |
| 45 | 1 |
| 46 | -1 |
| 47 | -127 |
| 48 | -666 |
| 49 | 212 |
| 50 | 605 |
| 51 | 442 |
| 52 | 11 |
| 53 | 18 |
| 54 | -2 |
| 55 | 1 |
| 56 | -1 |
| 57 | -255 |
| 58 | -2060 |
| 59 | 666 |
| 60 | 4439 |
| 61 | 4660 |
| 62 | 215 |
| 63 | 226 |
| 64 | -22 |
| 65 | 2 |