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 | 0 |
| 4 | -3 |
| 5 | 1 |
| 6 | 0 |
| 7 | 4 |
| 8 | -5 |
| 9 | 1 |
| 10 | 0 |
| 11 | -4 |
| 12 | 12 |
| 13 | -7 |
| 14 | 1 |
| 15 | 0 |
| 16 | 4 |
| 17 | -20 |
| 18 | 24 |
| 19 | -9 |
| 20 | 1 |
| 21 | 0 |
| 22 | -4 |
| 23 | 28 |
| 24 | -56 |
| 25 | 40 |
| 26 | -11 |
| 27 | 1 |
| 28 | 0 |
| 29 | 4 |
| 30 | -36 |
| 31 | 104 |
| 32 | -120 |
| 33 | 60 |
| 34 | -13 |
| 35 | 1 |
| 36 | 0 |
| 37 | -4 |
| 38 | 44 |
| 39 | -168 |
| 40 | 280 |
| 41 | -220 |
| 42 | 84 |
| 43 | -15 |
| 44 | 1 |
| 45 | 0 |
| 46 | 4 |
| 47 | -52 |
| 48 | 248 |
| 49 | -552 |
| 50 | 620 |
| 51 | -364 |
| 52 | 112 |
| 53 | -17 |
| 54 | 1 |
| 55 | 0 |
| 56 | -4 |
| 57 | 60 |
| 58 | -344 |
| 59 | 968 |
| 60 | -1452 |
| 61 | 1204 |
| 62 | -560 |
| 63 | 144 |
| 64 | -19 |
| 65 | 1 |