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 | -2 |
| 8 | -2 |
| 9 | 1 |
| 10 | 1 |
| 11 | -3 |
| 12 | -6 |
| 13 | 3 |
| 14 | 1 |
| 15 | 1 |
| 16 | -5 |
| 17 | -15 |
| 18 | 15 |
| 19 | 5 |
| 20 | -1 |
| 21 | 1 |
| 22 | -8 |
| 23 | -40 |
| 24 | 60 |
| 25 | 40 |
| 26 | -8 |
| 27 | -1 |
| 28 | 1 |
| 29 | -13 |
| 30 | -104 |
| 31 | 260 |
| 32 | 260 |
| 33 | -104 |
| 34 | -13 |
| 35 | 1 |
| 36 | 1 |
| 37 | -21 |
| 38 | -273 |
| 39 | 1092 |
| 40 | 1820 |
| 41 | -1092 |
| 42 | -273 |
| 43 | 21 |
| 44 | 1 |
| 45 | 1 |
| 46 | -34 |
| 47 | -714 |
| 48 | 4641 |
| 49 | 12376 |
| 50 | -12376 |
| 51 | -4641 |
| 52 | 714 |
| 53 | 34 |
| 54 | -1 |
| 55 | 1 |
| 56 | -55 |
| 57 | -1870 |
| 58 | 19635 |
| 59 | 85085 |
| 60 | -136136 |
| 61 | -85085 |
| 62 | 19635 |
| 63 | 1870 |
| 64 | -55 |
| 65 | -1 |