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 | -1 |
| 9 | -1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 0 |
| 13 | 1 |
| 14 | 1 |
| 15 | 1 |
| 16 | -5 |
| 17 | 10 |
| 18 | -10 |
| 19 | 5 |
| 20 | -1 |
| 21 | 1 |
| 22 | -5 |
| 23 | -4 |
| 24 | 25 |
| 25 | -4 |
| 26 | -5 |
| 27 | 1 |
| 28 | 1 |
| 29 | 15 |
| 30 | 64 |
| 31 | 50 |
| 32 | -50 |
| 33 | -64 |
| 34 | -15 |
| 35 | -1 |
| 36 | 1 |
| 37 | 15 |
| 38 | 65 |
| 39 | 66 |
| 40 | 30 |
| 41 | 66 |
| 42 | 65 |
| 43 | 15 |
| 44 | 1 |
| 45 | 1 |
| 46 | -55 |
| 47 | 455 |
| 48 | -671 |
| 49 | 1410 |
| 50 | -1410 |
| 51 | 671 |
| 52 | -455 |
| 53 | 55 |
| 54 | -1 |
| 55 | 1 |
| 56 | -55 |
| 57 | 1815 |
| 58 | -4730 |
| 59 | 11495 |
| 60 | -7251 |
| 61 | 11495 |
| 62 | -4730 |
| 63 | 1815 |
| 64 | -55 |