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 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 1 |
| 7 | -2 |
| 8 | 1 |
| 9 | 0 |
| 10 | 1 |
| 11 | -3 |
| 12 | 4 |
| 13 | 0 |
| 14 | 0 |
| 15 | 1 |
| 16 | -4 |
| 17 | 9 |
| 18 | -4 |
| 19 | -1 |
| 20 | 0 |
| 21 | 1 |
| 22 | -5 |
| 23 | 16 |
| 24 | -18 |
| 25 | 0 |
| 26 | 1 |
| 27 | 0 |
| 28 | 1 |
| 29 | -6 |
| 30 | 25 |
| 31 | -48 |
| 32 | 27 |
| 33 | 8 |
| 34 | -1 |
| 35 | 0 |
| 36 | 1 |
| 37 | -7 |
| 38 | 36 |
| 39 | -100 |
| 40 | 128 |
| 41 | -27 |
| 42 | -24 |
| 43 | 1 |
| 44 | 0 |
| 45 | 1 |
| 46 | -8 |
| 47 | 49 |
| 48 | -180 |
| 49 | 375 |
| 50 | -320 |
| 51 | -27 |
| 52 | 48 |
| 53 | 0 |
| 54 | 0 |
| 55 | 1 |
| 56 | -9 |
| 57 | 64 |
| 58 | -294 |
| 59 | 864 |
| 60 | -1375 |
| 61 | 704 |
| 62 | 243 |
| 63 | -64 |
| 64 | -1 |
| 65 | 0 |
| 66 | 1 |
| 67 | -10 |
| 68 | 81 |
| 69 | -448 |
| 70 | 1715 |
| 71 | -4104 |
| 72 | 4875 |
| 73 | -1280 |
| 74 | -810 |
| 75 | 48 |
| 76 | 2 |
| 77 | 0 |