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 | -1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 9 |
| 8 | 0 |
| 9 | -1 |
| 10 | 1 |
| 11 | 0 |
| 12 | -34 |
| 13 | 0 |
| 14 | 1 |
| 15 | 0 |
| 16 | -25 |
| 17 | 0 |
| 18 | 90 |
| 19 | 0 |
| 20 | -1 |
| 21 | -1 |
| 22 | 0 |
| 23 | 195 |
| 24 | 0 |
| 25 | -195 |
| 26 | 0 |
| 27 | 1 |
| 28 | 0 |
| 29 | 49 |
| 30 | 0 |
| 31 | -931 |
| 32 | 0 |
| 33 | 371 |
| 34 | 0 |
| 35 | -1 |
| 36 | 1 |
| 37 | 0 |
| 38 | -644 |
| 39 | 0 |
| 40 | 3334 |
| 41 | 0 |
| 42 | -644 |
| 43 | 0 |
| 44 | 1 |
| 45 | 0 |
| 46 | -81 |
| 47 | 0 |
| 48 | 4788 |
| 49 | 0 |
| 50 | -9846 |
| 51 | 0 |
| 52 | 1044 |
| 53 | 0 |
| 54 | -1 |
| 55 | -1 |
| 56 | 0 |
| 57 | 1605 |
| 58 | 0 |
| 59 | -25290 |
| 60 | 0 |
| 61 | 25290 |
| 62 | 0 |
| 63 | -1605 |
| 64 | 0 |
| 65 | 1 |